Arianne is an engine to develop multiplayer online games like Stendhal
Arianne is a multiplayer online engine to develop turn based and real time games, providing a simple way of creating the game server rules and clients like our MORPG Stendhal. Our engine Marauroa uses Java and SQL for hosting hundreds of players on a solo host.
Stendhal is a fun friendly and free multiplayer online adventure game with a huge and rich world.
A codebase for the construction of 3d online virtual worlds. Includes everything you need to make your own multiplayer online roleplaying game. All game rules are contained in plugins which can be written in easy scripting languages such as Python.
OpenRTS is an open source realtime strategy game. It features isometric graphics, networked multiplayer and single-player scenarios. The game is being developed using Python and SDL. The game runs on at least Linux, Windows and Mac.
NiL is a modular multi-purpose gaming engine including a multiplayer worm game a little like quake, except it's 2d and a little like worms except it's realtime.