Java decentralized cross-platform network multiplayer game engine
Free strategy browsergame engine.
AutoTeach makes kids study and learn in exchange for internet access.
Java Gamepad API for multiple platforms
Library for creating turn-based games with simultaneous moves.
Modular Gaming Open Source Persistent Browser Based Game Framework
TurboSphere is an easy to learn and powerful JS based game engine.
A world editor for HGE game engine written in python and uses OpenGL.
Pygrid is an open-source and cross-platform pygame/python 2D engine.
A multiplatform game engine for interactive fiction experiences
Open source network game service
A truly extensible cross-platform game engine
Pear3DEngine is a modern and modular 3D development framework
An extensible development framework for roleplay games.
C-Lesh is a game programming language for 2D games.
DiaT is a Textadventure
Cross-platform reimplementation of AMOS BASIC (runtime)
An HTML web game platform
Simple Point & Click Game