serge - 0.4
serge is a game engine written on top of pygame.
serge is a powerful game engine built on pygame and using pymunk for physics.
serge provides powerful classes for the core engine, world, actor, sprite, physics, sound and font handling. serge is easy to use and well documented and comes with a wide variety of building blocks to provide higher level functionality like behaviours, ui layouts etc. There is a tutorial which takes you through the development of a simple game.
serge has been used for seven complete games,
serge also has a git project on Google code so you can contribute or fork the engine.