iFixit

Dynamic mathematics software. Geometry, algebra, calculus visualization.

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

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

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

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

Pronunciation dictionary. Native speakers pronounce words in their language.