For exploring cellular automata like Conway's Game of Life.
... the open-source glide computer
The classic toy reinvented in free software!
An interactive pi walk.
Random any number you want as many as you want
Python implementation of the Dual N-Back mental exercise
Some pythons plugins to enhance fantasy maps creation with QGis
Grid based multiplication, add, sub including (-)ve #s
Access to Irrlicht Engine SDK from assembler, C, Python, Basic, Pascal