A game engine written in the D programming language
A Flash Molehill (Stage3D) GPU accelerated 2D game engine
a very lightweight advanced terrain-rendering and 3D map rendering sys
A pygame music lib.
Plugin based multi-purpose dev tool.
Pygrid is an open-source and cross-platform pygame/python 2D engine.
The Flixel Power Tools are a set of plug-ins for Flixel 2.5+
A graphics engine + toolkit.
Cross platform 2D game creation framework with Python bindings
Graph editing tool
The solution to all your problems
C-Lesh is a game programming language for 2D games.
Access to Irrlicht Engine SDK from assembler, C, Python, Basic, Pascal
Cross-platform reimplementation of AMOS BASIC (runtime)
Multi-Language Wrapper Collection for the Irrlicht Engine