PICO-8 is available for desktop platforms as well, it is not open-source, and there's a 3D version as well, called the Voxatron.
Both are really cool projects, but not open-source software.
Voxatron is a game (even though you can make expansions on the engine), and predates PICO-8
http://www.lexaloffle.com/bbs/?tid=28325
You can run PICO8 carts in Voxatron now. :)
PICO-8 is available for desktop platforms as well, it is not open-source, and there's a 3D version as well, called the Voxatron.
Both are really cool projects, but not open-source software.