I am working on "Free Hero Mesh" project (but it is not written in Python or Java). It is a puzzle game engine, and is FOSS.

Things that I can use help with are including (but not necessarily limited to):

- Promotion of project

- Testing

- Bug reports and feature requests

- If you are interested to make something with this

- Porting and distributions

- Patches to the code, if necessary

- Maybe someone has idea to improve documentation (such as tutorials) or to make a logo, or something else

http://chiselapp.com/user/zzo38/repository/freeheromesh