SDL Game Engine!

Orx - a portable open source game engine

Pygame is a set of Python modules designed for writing games. Pygame adds functionality on top of the excellent SDL library.

Cross-platform windowing and multimedia library for Python.

Arianne is a multiplayer online games framework and engine to develop turn based and real time games. It provides a simple way of creating games on a portable and robust server architecture. The server is coded in Java and you may use Python for your game description, provides a MySQL or H2 database backend and uses an TCP transport channel to communicate with hundreds of players.

HGE is an easy to use yet powerful hardware accelerated 2D game engine. It is a full featured middleware for all who want to develop commercial quality 2D games rapidly and easily. It covers all imaginable 2D game genres: you could create everything from a simple puzzle to advanced multilayered platformer or strategy without even thinking of any non game logic code! And you don't have to know anything about "window messages", DirectX programming and all that stuff. Instead you can start developing your own game within 15 minutes! »