About the SGE
The Stellar Game Engine (abbreviated "SGE", pronounced as "Sage") is a free 2-D game engine. The purpose of the SGE is to make game development easier, which allows more rapid development by experienced game developers and also helps less experienced game developers learn how to develop games.
The SGE is written in and for Python. It is designed to easily allow multiple implementations. Currently, only a Pygame implementation is available. An alternative Pyglet implementation will be developed in the future.
Official implementations of the SGE are free software (where "free" refers to freedom, not price; see the Free Software Definition for more information), and the documentation has been (to the extent legally possible) released to the public domain via the CC0 license.
The SGE was originally a sub-project of another project called "Stellar", hence the name.