Learning & Reference

Sci-Fi Interfaces

Celebrating interface design in science fiction films. Features The Fritzes awards for best believable and narrative interfaces, in-depth analysis of UI/UX in movies, and lessons for real-world interaction design. Created by Christopher Noessel, author of Make It So. Stop watching sci-fi. Start using it.

Hackster.io

Community for electronics and hardware hacking. Tutorials, projects, and news for Arduino, Raspberry Pi, and other development boards.

CSS-Tricks

CSS-Tricks is actively maintained with recent articles published as recently as February 4, 2026. It is a high-quality, independent resource focused on web development education with an emphasis on CSS, HTML, and frontend technologies. The site maintains professional curation, comprehensive documentation via its Almanac section, and regular content updates. It aligns perfectly with the directory's philosophy of human-made, independent web content with quality focus rather than corporate marketin

I Love Typography

Typography and font design blog. In-depth articles, interviews, and showcases of type design and lettering.

LinuxCommand.org

Learn the Linux command line. Classic, comprehensive tutorial on shell scripting and Unix command-line tools.

Explorable Explanations

A hub for learning through interactive, play-based exploration. Curated collection of explorable explanations and tools for creating them. Founded by Bret Victor's pioneering work.

Codrops

Codrops is an actively maintained, independent resource for web creativity and design since 2009. It features human-curated tutorials, design case studies, and a carefully selected gallery (Webzibition) of 2,230+ quality websites. The site embodies the independent web philosophy with genuine focus on creativity and quality over corporate marketing.

Exercism

Exercism is actively maintained (HTTP 200, modern web stack, CloudFlare hosting), independent/community-funded nonprofit, 100% free, focused on quality learning with 7966+ exercises, world-class mentoring, 79 language tracks, and genuine educational mission not corporate marketing

All About Berlin

Comprehensive guide to living in Berlin. Bureaucracy, housing, and practical advice.

Martin Heinz

DevOps and Python tutorials. Practical guides for modern development.

Red Blob Games

Amit Patel's interactive tutorials on pathfinding, map generation, and game algorithms.

Anton Zhiyanov

SQL, SQLite, and database internals. Interactive tutorials and deep dives.

One Useful Thing

Ethan Mollick on AI in education and work. Practical takes from a Wharton professor.

The Textile Atlas

Directory of global textile traditions. Artisan techniques documented.

Sublime Stitching

Modern embroidery patterns and tutorials. Making embroidery cool again.

Craftsy

Video craft classes. Quilting, sewing, knitting, and baking.

The Spruce Crafts

Craft tutorials across disciplines. Knitting, sewing, paper, and more.

The Pottery Wheel

Pottery tutorials and tips. From beginner to advanced techniques.

Ceramic Arts Network

Pottery and ceramics community. Techniques, glazes, and firing.

Closet Core

Modern sewing patterns. Ethical fashion you make yourself.

Colette Blog

Sewing patterns and tutorials. Garment construction techniques.

Tilly and the Buttons

Learn to sew clothes. Patterns and tutorials for beginners.

Purl Soho

Free knitting and sewing patterns. Beautiful projects with clear instructions.

OSE Wiki

Documentation for open source machines. Build your own civilization starter kit.

Accessibility Developer Guide

Swiss foundation's comprehensive guide. WCAG implementation explained.

Inclusive Components

Heydon Pickering on accessible UI patterns. Deep dives into components.

Sky & Telescope

Amateur astronomy magazine. News, observing guides, and equipment reviews.

Smart Mapping Guide

ESRI's guide to effective data visualization on maps.

mapschool

Free introduction to geo. Learn mapping concepts simply explained.

Permaculture News

Global permaculture community. Design principles for sustainable living.

Appropedia

Wiki for appropriate technology and sustainability. DIY solutions for the world.

GIJN

Global Investigative Journalism Network. Resources and training for journalists.

Food Timeline

History of food and cooking. When foods were invented and how.

Cook's Country

American home cooking with tested recipes. ATK's regional focus.

Maangchi

Korean cooking by the YouTube grandmother of Korean food.

The Woks of Life

Chinese recipes from a family kitchen. Authentic and accessible.

Just One Cookbook

Authentic Japanese home cooking. Nami teaches traditional recipes.

King Arthur Baking

Thoroughly tested baking recipes. Tips from professional bakers.

NYT Cooking

Tested recipes with ratings and comments. Sam Sifton curates.

Omniglot

Encyclopedia of writing systems and languages. Scripts, alphabets, and constructed languages.

LanguageGuide

Visual vocabulary and grammar. Audio for dozens of languages.

Online Etymology Dictionary

Word origins and history. Trace English words to their roots.

Wiktionary

Collaborative dictionary with etymology. Covers every language.

LanguagePod101

Audio and video lessons for many languages. Structured curriculum with native speakers.

Lexilogos

Multilingual dictionary portal. Keyboards, translators, and resources for hundreds of languages.

italki

Find language tutors worldwide. Affordable one-on-one lessons.

GeoGebra

Dynamic mathematics software. Geometry, algebra, calculus visualization.

Mathigon

Interactive math textbook. Explorations of geometry, algebra, and more.

Math is Fun

Math explained simply. Algebra, geometry, data analysis for all ages.

Security in a Box

Digital security tools and tactics for activists and journalists.

Privacy Guides

Community-driven privacy and security recommendations. Successor to PrivacyTools.

A List Apart

A List Apart is a well-maintained, actively published web design and development publication with recent articles (published January 2026). The site maintains high editorial standards, features contributions from recognized industry experts, covers substantive professional topics with depth across design, development, UX, content strategy, and accessibility. It perfectly fits the directory philosophy of human-made, independent web resources with quality content. The publication is backed by Nort

Smashing Magazine

Smashing Magazine is an active, well-maintained independent publication founded in 2006. It's a genuine quality content platform for web professionals covering design, development, and UX—not a corporate marketing site. The site publishes substantive technical articles multiple times per week, maintains an active community with 1,900+ members, and focuses on education and professional development rather than clickbait advertising. It fits the directory philosophy perfectly as human-curated, inde

MatterHackers Articles

3D printing tutorials and material guides. Filament comparisons and technique deep dives.

Simplify3D Troubleshooting

Visual guide to 3D print problems. Identify issues and fixes from pictures.

All3DP

3D printing magazine. Reviews, guides, and industry news.

RepRap

Self-replicating 3D printer project. The origin of desktop 3D printing.

Ellis Print Tuning Guide

Advanced 3D print tuning. Pressure advance, input shaping, and quality optimization.

Teaching Tech Calibration

3D printer calibration guide. Step-by-step tuning for perfect prints.

r/3Dprinting Wiki

Community 3D printing knowledge base. Printer comparisons, troubleshooting, and beginner guides.

Lock Lab

BosnianBill's resources. Video tutorials and lock reviews.

Art of Lock Picking

Lockpicking guides and tutorials. Beginner-friendly techniques and tool guides.

Lock Wiki

Encyclopedia of locks and lockpicking. Mechanism explanations and history.

ZineWiki

Wiki documenting zine culture. History, zinesters, and distros.

Webmention

W3C web standard for mentions. Cross-site comments without centralized platforms.

The Small Web

Resources for building a smaller web. Minimal sites, local-first software.

Gemini Quickstart

Getting started with Gemini. Clients, servers, and hosting guides.

Gemini Protocol

Official Gemini documentation. The lightweight internet protocol specification.

Wikibooks Conlang

Collaborative guide to language construction. Theory, tutorials, and examples.

FrathWiki

Constructed languages wiki. Documentation of conlangs and conworlds.

Zompist

Mark Rosenfelder's language construction resources. The Language Construction Kit and Almea.

Smart Home Beginner

Docker and home automation guides. Traefik, Authelia, and self-hosting tutorials.

Home Network Guy

Home networking tutorials. OPNsense, VLANs, and network security.

Techno Tim Docs

Homelab tutorials and documentation. Kubernetes, Proxmox, and infrastructure.

Perfect Media Server

Alex Kretzschmar's media server guide. Complete homelab setup documentation.

ServeTheHome

Server and workstation hardware reviews. Enterprise gear for homelabs.

The Field Recordist

Field recording techniques and gear. Tutorials and microphone comparisons.

Defense Mechanism

LSDJ tutorials and resources. Learn Game Boy music production.

Vinyl Engine

Turntable database and forums. Manuals, reviews, and setup guides.

Synth-DIY

DIY synthesizer mailing list and wiki. Build your own modules and instruments.

Perfect Circuit - Signal

Synth news and educational content. Module guides and artist features.

Learning Modular

Chris Meyer's modular synth courses. Structured learning for Eurorack.

Hardcore Gaming 101

In-depth retro game coverage. Series retrospectives and obscure game deep dives.

Racketboy

Retro gaming guides. Hidden gems, collecting advice, and system histories.

The Cutting Room Floor

Unused and cut video game content. Debug modes, regional differences, and hidden secrets.

Emulation General Wiki

Emulator recommendations and setup guides. Best emulators for every system.

NetHack Wiki

Comprehensive NetHack reference. Spoilers, strategies, and game mechanics.

Brogue Wiki

Community wiki for Brogue. Strategy guides, item details, and dungeon mechanics.

RogueBasin

Roguelike development wiki. Game design, programming tutorials, and genre history.

Deer Tier

Speedrunning resources and guides. Community wiki for various games.

World of Tea

Tea education and certification. Industry knowledge and professional development.

Serious Eats - Tea

Tea guides and reviews. Brewing techniques and variety explanations.

Mei Leaf Articles

Chinese tea education. Gongfu brewing, tea types, and selection guides.

TeaDB

Pu-erh and Chinese tea resource. Reviews, vendor lists, and educational articles.

r/tea Wiki

Comprehensive tea guide. Types, brewing, vendors, and beginner recommendations.

Serious Eats - Cocktails

Tested cocktail recipes with technique explanations. Science-driven drink making.

Liquor.com

Cocktail recipes and spirits guides. Classic and modern drinks with video tutorials.

Cocktail Chemistry

Nick Fisher's cocktail science. Recreating movie drinks and exploring techniques.

r/cocktails Wiki

Community cocktail knowledge base. Beginner guides, essential bottles, and technique FAQ.

Difford's Guide

Cocktail recipe database. Thousands of drinks with ratings, variations, and technique guides.

Brod & Taylor Blog

Fermentation and baking recipes. Yogurt, tempeh, sourdough with controlled proofing.

Fermented Foods Australia

Sharon Flynn's fermentation guides. Kimchi, miso, tempeh, and vegetable ferments.

Kombucha Kamp

Comprehensive kombucha resource. Brewing guides, troubleshooting, and SCOBY care.

Cultures for Health

Fermentation tutorials and guides. Kefir, kombucha, yogurt, and vegetable ferments.

The Perfect Loaf

Maurizio Leo's baking guides. Detailed sourdough recipes with baker's percentages.

Sourdough.co.uk

Vanessa Kimbell's sourdough resource. Science, recipes, and the sourdough library project.

Perfect Daily Grind

Coffee industry news and education. Origin stories, processing, and brewing guides.

Barista Hustle

Professional coffee education. Brewing science, espresso theory, and free courses.

Andrew Skurka

Professional backpacker's guides. Gear, skills, and route planning for serious adventures.

SummitPost

Mountain encyclopedia and climbing routes. Peak info, trip reports, and photos.

Postholer

Long-distance trail planning. PCT, AT, CDT data, town guides, and resupply info.

The Virtual Cave

Educational cave photography and geology. Speleothem formations explained with images.

First Nature Fungi

UK and European mushroom guide. Species profiles with habitat and identification notes.

Practical Self Reliance - Foraging

Foraging guides organized by season. Plant profiles and preservation techniques.

Eat The Weeds

Green Deane's wild plant foraging resource. Plant identification and edibility guides.

Forager Chef

Alan Bergo on wild food cooking. Recipes and techniques for foraged ingredients.

MushroomExpert.com

Michael Kuo's mushroom identification resource. Detailed species pages with microscopy and keys.

Audubon Bird Guide

National Audubon Society's species database. Range maps, photos, and conservation status.

Sibley Guides

David Sibley's bird identification resources. The gold standard in North American field guides.

Bird Watching Daily

Birding news and tips. Species profiles, gear reviews, and hotspot guides.

All About Birds

Cornell Lab's bird guide. Species accounts, sounds, and identification tips for North American birds.

Sighack

Manohar Vanga on generative art algorithms. Deep dives into flow fields, noise, and organic patterns.

Generative Hut

Plotter art tutorials and experiments. Code, techniques, and beautiful output.

Woodworking Masterclasses

Paul Sellers' video courses. Complete project builds from start to finish using hand tools.

Paul Sellers

Master woodworker's free tutorials. Hand tool techniques with decades of teaching experience.

The Renaissance Woodworker

Shannon Rogers on traditional hand tool work. Detailed project builds and technique videos.

The Wood Database

Encyclopedic wood species reference. Properties, workability, and identification for hundreds of species.

Fine Woodworking

Premium woodworking content. Expert techniques, furniture plans, and shop setup guides.

Popular Woodworking

Woodworking magazine online. Project plans, techniques, tool reviews, and video tutorials.

D.Comeau Custom Knives

Knifemaker's tutorials and guides. Step-by-step process documentation.

Japanese Knife Imports Blog

Jon Broida on Japanese knives. Sharpening, steel types, and kitchen knife knowledge.

Nigel Armitage

British saddler and leather educator. Courses, videos, and traditional techniques.

Dieselpunk.ro

Romanian leatherworker's tutorials and patterns. Detailed guides for bags and accessories.

RM Leather Free Patterns

Free downloadable leathercraft patterns. Wallets, bags, and accessories with templates.

Instructables Leatherworking

Community leathercraft tutorials. Step-by-step projects from wallets to armor.

Learn Watchmaking

Watchmaking tutorials and guides. Learn to service and repair mechanical watches.

Calibre 11

TAG Heuer and vintage chronograph specialists. Deep historical research and references.

Your Watch Hub

Watch encyclopedias and guides. Movement databases and brand histories.

Hodinkee

Watch journalism and collecting. In-depth articles on horology, reviews, and industry news.

Mountain of Ink

Comprehensive fountain pen ink reviews. Swatches, water tests, and comparisons across papers.

JetPens Blog

In-depth guides to Japanese stationery. Pen comparisons, ink swatches, and paper reviews.

Switch and Click

Mechanical keyboard guides and reviews. Switch comparisons, build tutorials, and buying guides.

QMK Firmware Docs

Documentation for QMK, the open source keyboard firmware. Features, customization, and flashing guides.

keybr.com

Typing practice that adapts to your weaknesses. Algorithm generates lessons based on your problem keys.

Deskthority

Mechanical keyboard wiki and forums. Deep encyclopedia of switches, vintage boards, and modifications.

Keyboard University

Comprehensive guide to mechanical keyboards. Switches, layouts, keycaps, and build guides for beginners.

Electronics Notes - Ham Radio

Encyclopedic amateur radio reference. Antennas, propagation, modes, and technical fundamentals.

HamStudy.org

Free amateur radio exam study resource. Practice tests and flashcards for all US license classes.

RTL-SDR.com

Software defined radio tutorials and news. Turn cheap TV tuners into powerful radio receivers.

Signal Identification Wiki

Database of radio signals. Identify unknown transmissions by their sound and waterfall pattern.

eHam.net

Ham radio encyclopedic resource. Equipment reviews, articles, swap shop, and active forums.

ARRL

American Radio Relay League. The national association for amateur radio in the US. News, licensing info, and technical resources.

RGBA

Inigo Quilez's demogroup and resource site. Mathematical art, raymarching tutorials, and Shadertoy's creator.

Permacomputing

Wiki about sustainable computing. Principles for designing systems that last and minimize environmental impact.

Wait But Why

Tim Urban's long-form illustrated essays. AI, procrastination, Fermi paradox, and more.

Phrack Magazine

The legendary hacker ezine since 1985. Technical articles on security, exploitation, and hacker culture. Issue 72 in 2025.

Complexity Explorables

Interactive explorations of complex systems. Emergence, chaos, networks - play with the math.

tldr pages

Simplified man pages. Community-maintained examples for command-line tools that actually help.

command-not-found

Find the package that contains a command. Covers major Linux distributions and macOS.

Project Drawdown

World's leading resource for climate solutions. 100 solutions to reverse global warming.

Bartosz Ciechanowski

Stunning interactive explainers on mechanical watches, GPS, cameras, and more. Engineering education at its finest.

tmp.0ut

ELF research group and zine. Deep technical content on binary hacking, virus writing, and Linux internals.

PoC||GTFO

Proof of Concept or GTFO. Hacker journal with deeply technical essays on reverse engineering and file formats. Often a valid PDF, ZIP, and bootable OS simultaneously.

Exploit Database

Archive of public exploits and vulnerable software. Essential resource for security researchers and penetration testers.

HackTricks

Massive wiki of hacking techniques for CTFs and pentesting. Privilege escalation, web attacks, and more.

Typewolf

Curated typography inspiration. See what fonts websites are using and get recommendations.

Practical Typography

Matthew Butterick's guide to typography. Free online book covering everything from font choice to page layout.

commandlinefu

Repository of command-line snippets. User-submitted one-liners for common and obscure tasks.

Khan Academy

Free education for anyone, anywhere. Math, science, computing, and more with personalized learning.

Brilliant

Interactive courses in math, science, and CS. Learn by solving problems, not watching videos.

3Blue1Brown

Grant Sanderson's math animations. Beautiful visualizations that build genuine understanding.

Better Explained

Math and programming concepts explained intuitively. Focus on understanding over memorization.

VisuAlgo

Visualize algorithms and data structures. Step through sorting, trees, graphs, and more.

Linguee

Translation search engine. See how words and phrases are translated in real documents.

Intuitive Explanations

Radon Rosborough's blog on math and tech. Documented Replit's legal threats against open source projects.

Awesome ChatGPT Prompts

Collection of prompt examples for ChatGPT. Creative, useful, and fun prompts to try.

OSSU Computer Science

Path to a free self-taught CS education. 200K+ stars. Complete curriculum using free online courses.

Free Programming Books

Freely available programming books in many languages. 350K+ stars. The ultimate free learning resource.

Project Based Learning

Curated list of project-based tutorials. Learn by building real projects in various languages.

Build Your Own X

Master programming by recreating technologies from scratch. Build your own Git, Docker, database, etc.

DPReview

Digital photography reviews. In-depth camera and lens reviews with sample images.

Writer's Digest

Resources for writers since 1920. Craft advice, markets, and publishing guidance.

MIT OpenCourseWare

Free MIT course materials. Lectures, notes, and assignments from real MIT classes.

Coursera

Online courses from top universities. Free to audit, certificates available.

edX

Free online courses from Harvard, MIT, and more. Founded by universities.

freeCodeCamp

Learn to code for free. Full curriculum from HTML to machine learning.

The Odin Project

Free full-stack web development curriculum. Project-based learning path.

Full Stack Open

Deep dive into modern web development. University of Helsinki's free course.

Teach Yourself CS

Curated guide to self-teaching computer science. Best resources for each topic.

The Missing Semester

MIT course on practical computing skills. Shell, Git, debugging, and more.

Crafting Interpreters

Free book on implementing programming languages. Build two interpreters from scratch.

Eloquent JavaScript

Free book on JavaScript and programming. A modern introduction with exercises.

Go by Example

Hands-on introduction to Go. Annotated example programs.

Destroy All Software

Gary Bernhardt's screencasts on software. Advanced topics explained well.

Wizard Zines

Julia Evans' illustrated zines on technical topics. Git, SQL, Linux, and more.

RegexOne

Interactive regex tutorial. Learn regular expressions step by step.

SQLZoo

Interactive SQL tutorial. Practice queries on real databases.

PostgreSQL Tutorial

Comprehensive PostgreSQL guide. From basics to advanced topics.

Use The Index, Luke

SQL indexing and tuning guide. Make your database queries fast.

High Scalability

How real sites handle scale. Architecture case studies from tech companies.

Learning Music

Ableton's interactive music course. Learn beats, melody, and production basics in your browser.

Learning Synths

Interactive introduction to synthesizers. Play with oscillators, filters, and envelopes in the browser.

Reverso Context

See translations in context. Millions of examples from real texts in multiple languages.

Forvo

Pronunciation dictionary. Native speakers pronounce words in their language.

Serious Eats

Science-based cooking. Kenji Lopez-Alt and team explain why techniques work, not just how.

No-Recipe Recipes

NYT's approach to intuitive cooking. Teaches techniques over rigid measurements.

Budget Bytes

Delicious recipes that won't break the bank. Every recipe includes cost breakdown.

Based Cooking

Simple recipes in plain text. No popups, no life stories, just ingredients and instructions.

TypeLit

Practice typing by retyping entire novels. Learn to type faster while reading classic literature.

Emoji to Scale

Explore the relative sizes of emoji objects. Scroll through a visual comparison from atoms to galaxies.

Awesome Falsehood

Curated list of falsehoods programmers believe. Names, time, addresses, and more gotchas.

Headspace

Meditation and mindfulness app. Guided sessions for stress, sleep, and focus.

Duolingo

Free language learning. Gamified lessons in 40+ languages with millions of users.

Clozemaster

Learn vocabulary in context. Fill-in-the-blank exercises with real sentences.

Tatoeba

Collection of sentences and translations. User-contributed parallel corpus for language learning.

Language Transfer

Free audio courses teaching thinking methods for languages. Spanish, French, German, and more.

Refold

Immersion-based language learning roadmap. Learn languages the way children do.

Art of Problem Solving

Math training for bright students. From contest math to university preparation.

Cut The Knot

Interactive mathematics miscellany. Hundreds of puzzles, proofs, and explorations.

Project Euler

Challenging mathematical/programming problems. 800+ problems requiring code and math.

The A11Y Project

Community-driven guide to web accessibility. Resources, checklist, and patterns for inclusive design.

WebAIM

Web accessibility resources. Articles, tools, and training for making the web work for everyone.

Obsidian

Knowledge base that works on local Markdown files. Powerful linking, graph view, and extensible plugins.

Social Cooling

Interactive explainer on how data collection chills free expression. How surveillance changes behavior.

Stanford Encyclopedia of Philosophy

Authoritative, peer-reviewed philosophy reference. The definitive resource for philosophy.

Internet Encyclopedia of Philosophy

Peer-reviewed academic resource on philosophy. Accessible yet rigorous articles.

Daily Stoic

Stoic philosophy for everyday life. Practical wisdom from ancient philosophers.

Epicurious

Recipes, menus, and cooking guidance. Well-tested recipes from multiple sources.

NYT Cooking

Recipes from the New York Times. Expertly developed and thoroughly tested recipes.

The Kitchn

Daily food magazine. Recipes, tips, and inspiration for home cooks.

Bogleheads

Investment advice inspired by John Bogle. Forum for passive, low-cost investing.

Mr. Money Mustache

Financial independence through badassity. Early retirement and frugal living blog.

Investopedia

Financial education and market data. Learn investing concepts and track markets.

Refactoring Guru

Design patterns and refactoring techniques. Illustrated examples in multiple languages.

SourceMaking

Design patterns, antipatterns, and refactoring. Software design knowledge base.

The Twelve-Factor App

Methodology for building modern web apps. The definitive guide to SaaS development.

Semantic Versioning

Version numbering specification. The standard for software versioning.

Conventional Commits

Specification for commit messages. Standardize your git history.

Keep a Changelog

How to write a good changelog. Don't let your friends dump git logs.

Choose a License

Simple guide to open source licenses. Pick the right license for your project.

Git Immersion

Guided tour of Git fundamentals. Hands-on learning from basics to advanced.

Oh Shit, Git!

Git problems and how to fix them. For when you mess up.

Pro Git

The official Git book. Free, comprehensive, and authoritative.

nixCraft

Linux and Unix tutorials and tips. Practical sysadmin knowledge.

Linux Journey

Learn Linux step by step. From command line basics to system administration.

OverTheWire Wargames

Learn security through challenges. SSH-based hacking games.

Cryptopals

Learn cryptography by breaking it. Programming challenges teaching crypto.

pwn.college

Cybersecurity education platform. CTF-style learning from ASU.

TryHackMe

Learn cybersecurity through hands-on exercises. Guided hacking rooms.

PortSwigger Web Security Academy

Free web security training. Learn to find and exploit vulnerabilities.

Ben Eater

Build a computer from scratch. Video series on building a CPU, GPU, and networking from basic components.

All About Circuits

Free electrical engineering education. Textbooks, worksheets, calculators, and community forums.

Web Design in 4 Minutes

Interactive tutorial transforming plain HTML into a beautiful page. Learn CSS fundamentals step by step.

Visual Design Rules

Collection of visual design rules you can safely follow. Practical tips for making things look better.

Darebee

Free fitness resource. Workouts, programs, and challenges with no ads or fees.

Examine

Unbiased nutrition and supplement information. Evidence-based health research.

StrongLifts

Simple strength training program. 5x5 workout routine for beginners.

The Physics Classroom

Physics tutorials and interactives. Clear explanations of physics concepts.

PhET Simulations

Interactive science simulations. Physics, chemistry, biology, and math.

Falstad

Math and physics applets. Interactive simulations for learning.

MIT Physics OCW

Free MIT physics courses. From mechanics to quantum field theory.

Feynman Lectures

Richard Feynman's legendary physics lectures. Free online edition.

HyperPhysics

Encyclopedic physics reference. Concept maps connecting physics topics.

Chemguide

Chemistry tutorials for students. Clear explanations of chemistry concepts.

Organic Chemistry Portal

Organic chemistry resources. Reactions, mechanisms, and synthesis.

Library Genesis

Free access to books and papers. Shadow library for research and textbooks.

Songsterr

Guitar, bass, and drum tabs with playback. Learn songs with interactive notation.

Hooktheory

Understand music theory through popular songs. Learn how hit songs are constructed.

Open Culture

Free cultural and educational media. Courses, books, films, and more.

Gardening Know How

Gardening guides and tips. From vegetables to flowers to lawn care.

Old Farmer's Almanac Gardening

Planting calendar and gardening guides. Traditional wisdom for growers.

MathWorld

Comprehensive mathematics encyclopedia. Definitions, theorems, and explanations for every math concept.

Desmos

Beautiful, powerful graphing calculator in the browser. Free and used in schools worldwide.

OEIS

Online Encyclopedia of Integer Sequences. Look up any sequence of numbers and find its mathematical meaning.

Instructables

Step-by-step instructions for making anything. Crafts, electronics, cooking, and everything in between.

iFixit

Free repair guides for everything. Teardowns, parts, and tools to fix your own devices.

Learn X in Y Minutes

Quick reference guides for programming languages. Learn the syntax of a new language in one page.

Roadmap.sh

Community-driven roadmaps for developers. Visual guides for learning frontend, backend, DevOps, and more.

Julia Evans

Friendly, illustrated explanations of computer science concepts. Makes complex topics accessible through zines and blog posts.

explainshell

Paste a command line and get a breakdown of every argument. Essential for understanding complex shell commands.

Can I use

Browser support tables for web technologies. Check if that CSS feature works in your target browsers.

SQLite

The most deployed database in the world. Excellent documentation and fascinating technical articles about its design.

DevDocs

API documentation browser with offline support. Search across hundreds of frameworks in one place.

The Algorithms

Open source collection of algorithms implemented in multiple programming languages. Great for learning.

Nicky Case

Interactive explorable explanations of complex topics. Game theory, anxiety, social networks visualized.

IndieWeb

Movement to own your own content and identity online. Resources for building your personal website.

Distill

Machine learning research journal with interactive visualizations. Making ML concepts understandable.

Surveillance Self-Defense

EFF's guide to protecting yourself from surveillance. Practical security for activists and everyone.

Privacy Guides

Community-driven resource for privacy and security tools. Transparent recommendations, no affiliate links.