Try Fe₂O₃ in your browser
These run right here in the page, built from the same Rust code as the terminal apps. Nothing is installed, and they cannot reach your files.
funkeys
Eight games on funkey, the Fe₂O₃ game engine, from falling blocks to a dungeon crawl.
rpnx
A calculator in the style of the HP-41: the four-level stack, shift pages, and every XRPN command by name.
sky
The sky over any place on Earth, right now. Give a latitude and a longitude, then walk it and name the stars.
stars
461 named stars on the Hertzsprung-Russell diagram, the paths stars take as they age, and the sky.
exoplanets
The 6,309 known worlds by orbit and size, each system with its habitable zone.
moon
The Moon as it looks tonight, the days around it, and a map with the craters and seas named.
universe
37 steps from the quantum foam to the cosmic web, each one drawn.
elements
Every element with its numbers and its full Wikipedia article.
isotopes
3,386 isotopes with their decay modes and half-lives, and each decay chain to its end.
particles
The seventeen fundamental particles, and a zoom from a carbon atom down to one quark.
alchemy
Pour reagents together and watch the colour, the precipitate and the gas. Flame tests too.
circuit
Wire batteries, resistors, LEDs and logic chips and watch every voltage, with challenges from an LED to a stopwatch.
fractal
Mandelbrot, Julia, the logistic map, Lorenz and Hénon, to pan and zoom.