Programmable robotics construction set
Tiny judging environment for OI contest based on Lemon + LemonPlus
Android emulator
Learn about the earth, solar system, universe and the spacecraft exploring them
Simulator that runs MIPS32 assembly language programmes
Genealogy (family tree) app
LaTeX editor
Python IDE for beginners
Software to emulate the TI 84 Plus family of calculators
Learn ARM assembly language
Education app for teens