Vassal is a game engine for building and playing online adaptations of board games and card games. Play live on the Internet or by email. Vassal runs on all platforms, and is free, open-source software. This software requires java to run.
Talked about the Citrus Engine some time ago but back then only the non-commercial version was free, now it seems the engine is not only free, but open source and with a great 3D support.
Syntensity, also known as the Syntensity Engine, and previously also called the Intensity Engine, is an open source project that consists of a client, server, and master (metadata) server – everything you need to run your own games or your own virtual world.
GUNS and ROBOTS is a third person online shooter with endless list of customization features. The game combines fun art with almost unlimited game play. The characters are able to move freely all over the maps, engage in battles, climb up the rankings and unlock various achievements. They will be able to choose their equipment from variety of weapons and over 150 different parts.
Ethanon Engine is a free 2D game development tool focused on the recent video cards for hardware acceleration and shader effects. It may be used to develop any style of game, such as top-down view RPG’s, side scrollers and shoot’em up games. The main goal of this engine is to provide high-quality lighting, shadow and particle effects with an easy to use visual interface and a simple and direct scripting system. Games can be made for Windows, Android and iOS.
