#open-source

NationalDex — Pokédex Reference Tool

Minimal open-source web-based Pokédex covering all 1025 Pokémon across every generation. Features generation-specific stats, type matchups, learnsets, abilities, evolution data, and integration with Pokémon TCG cards. Allows browsing by type, building teams, and comparing Pokémon across game generations.

OpenTrailPaper — DIY e-paper bike computer

Open-source firmware and hardware design for a DIY e-ink bike computer based on the LilyGO T5S3. Features offline maps, GPS, Bluetooth sensor support, FIT recording, and firmware installable via browser. Actively maintained indie hardware project.

GentleOS/16 - Hobby OS for vintage 16-bit PCs

A handcrafted hobby operating system for vintage 16-bit PCs (8086+). Built in C, features a live browser-based emulator, runs on authentic hardware like Tandy and Amstrad portables, and is free and open source (GPL-2.0). Designed entirely for tinkering and technical joy.

Floe – Open-Source Audio Plugin for Sample Libraries

Free, open-source audio plugin (CLAP/VST3/AU) for discovering, performing, and transforming sounds across sample libraries. Features sample-based synthesis, granular processing, layering, and effects. GPL licensed, no accounts or subscriptions. Cross-platform (Windows/macOS/Linux). Built with emphasis on simplicity and user experience.

Laser Graffiti

Point a projector and webcam at a wall, draw with a laser pointer, and the projector paints your strokes in real-time. Open-source browser-based tool with features like wet ink drips, 3D spinning, kaleidoscope mirroring, and sparkle trails. Works without hardware via mouse/touch demo.

Cobalt: Kobo e-reader App Platform

Open-source application platform for Kobo e-readers featuring a signed App Store, Rust SDK, and isolated app runtime. Install once via USB; apps update over Wi-Fi. Enables running static ARM binaries on e-reader hardware with community-tested support across multiple Kobo models.

Shoehorn — Quantize LLMs to your hardware

Interactive browser-based tool for quantizing large language models to fit your personal machine. Scans Hugging Face's most-downloaded models, estimates which ones fit your specific hardware (Mac, GPU, custom configs), visualizes memory budgets, then provides a local CLI app and web interface to run the chosen model via llama.cpp. Combines practical utility with a clean, hands-on approach to a niche problem.

os8088: Mac-like GUI for IBM XT in real-mode assembly

A hobby project reimagining the early Macintosh desktop for 1980s IBM PC hardware. Written entirely in real-mode 8086 assembly, boots from floppy in 256KB, features overlapping windows, pull-down menus, preemptive multitasking, and can run multiple programs simultaneously. Open source (MIT), runnable in browser via emulator, with excellent documentation and a finished 1.0 release.

FreeInk — Open e-reader ecosystem

Open-source hardware and software collective building an e-reader ecosystem where every layer (software, firmware, hardware) is open for community extension and customization.

Xena Project Blog

Kevin Buzzard's personal blog documenting the Xena project—a long-running effort to formalize mathematics in Lean. Posts explore the intersection of interactive theorem provers, mathematical research, AI tools, and the future of formal mathematics. Substantial, opinionated writing from an academic mathematician.

neil.computer — Personal blog on infrastructure & DIY

neil.computer is an active personal blog focused on hands-on infrastructure, self-hosting, and DIY systems. The featured post is a detailed, practical guide to building a minimal ZFS NAS without commercial solutions like TrueNAS. The author explicitly values understanding their entire system and avoiding unnecessary abstraction layers. The blog has RSS/Atom syndication and IndieWeb markers, indicating active, thoughtful participation in the small web.

Cuelume — interaction sounds for the web

A tiny, dependency-free library of carefully designed Web Audio interaction sounds. The site showcases a beautiful interactive sound palette and serves as documentation for a crafted developer tool.

NextBSD — Revived BSD OS with macOS User-Space

Active open-source OS project merging Apple's open-source system layer (Mach IPC, launchd, libxpc, libdispatch, CoreFoundation) onto a modern FreeBSD kernel. Shows detailed technical component status (kernel, drivers, system services) and philosophy of 'open in the open.'

Q3Edit – Browser-based Quake III map editor

Open-source, in-browser level editor for Quake III Arena. Edit, compile, and playtest .map files with TypeScript + WebGL2 frontend and id Software's q3map + ioquake3 compiled to WebAssembly. Real tool, not marketing.

BambooGrid – Power Grid Modeling Tool

BambooGrid is an open-source web-based visual editor for power grid modeling and load-flow analysis. Built on Pandapower, it lets students and engineers design power networks and run simulations directly in the browser. A niche tool with genuine utility for its community.

jola.dev

Personal technical blog exploring practical experiments with local LLM inference on consumer hardware. Recent posts cover running open-source models on M-series Macs, comparing tools like Ollama and llama.cpp, and detailed configuration guides for achieving privacy-preserving AI without cloud dependencies.

TrueNAS

Open-source network-attached storage (NAS) operating system based on FreeBSD and Linux. The standard for self-hosted storage solutions.

Webrecorder

Open-source web archiving platform for creating high-fidelity, interactive archives of web content. Preserves the dynamic web as it's experienced.

Tom MacWright

Thoughtful essays on software, maps, and technology. Creator of several popular open source projects.

Awesome Self-Hosted

List of self-hosted services and web apps. 250K+ stars. The definitive guide to running your own servers.

Awesome Privacy

Curated list of privacy-respecting services and software. Alternatives to Big Tech that respect your data.

Awesome Sysadmin

Curated list of open source sysadmin resources. Monitoring, backup, configuration management, and more.

Lemmy

Federated link aggregator. Like Reddit but decentralized, open source, and community-owned.

antirez

Salvatore Sanfilippo, creator of Redis. Technical writing on programming, data structures, and open source.

Andreas Kling

Creator of SerenityOS and Ladybird browser. Building an operating system and browser from scratch as a learning project.

Intuitive Explanations

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

Wealthfolio

Private, open-source investment tracker. Track your portfolio without sending data to third parties.

Bryan's Workshop

Bryan made an open-source laptop from scratch. Hardware documentation, design files, and build logs.

Awesome Games

List of open source games. Play and learn from game source code across all genres.

Awesome Open Source Games

Curated list of open source games organized by genre. From FPS to puzzle games.

AlternativeTo

Crowd-sourced software recommendations. Find open source alternatives to any application.

Open Source Alternative

Curated list of open source alternatives to popular SaaS products. Self-host everything.

Ghostty

Fast, feature-rich terminal emulator by Mitchell Hashimoto (HashiCorp founder). Native performance with modern features.

Choose a License

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

Open Source Agenda

Discover trending open source projects. Categories, tags, and popularity metrics.

F-Droid

Catalogue of free and open source Android apps. Alternative app store with no tracking or proprietary code.

OpenStreetMap

The Wikipedia of maps. Free, editable map of the world built by volunteers.

Hundred Rabbits

A small studio aboard a sailboat making open source tools, games, and documenting off-grid creative computing.

SQLite

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

The Algorithms

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

Excalidraw

Virtual whiteboard for sketching hand-drawn like diagrams. Open source, real-time collaboration, end-to-end encrypted.