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A browser lever puzzle. Flip levers to raise a path and roll

Live Multilingual Dictionary in 120+ Languages

A fresh set of free daily logic puzzles every day

AI turns lecture videos into course PDFs and books.

A strategic daily world geography challenge.

A living, citable index of unsolved problems

AI writes the code. CodeTrain makes sure your engineers

A toy subtractive synth.

Live telemetry from an SSH honeypot for security research,th

Get to the exit in the least number of moves

Open the ReadKinetic speed reader. Import an EPUB, PDF, or

Notebooker keeps everything you collect - and answers

A documented map-based directory of the historic adobe and

An interactive tool for designing curved-crease origami.

Live countdown, an interactive path map, and exact local