Arianne is an engine to develop multiplayer online games like Stendhal
JavaScript framework to build game engines, games, emulators and apps
C/C++ , PHP, PYTHON, 3D ENGINES, CHROME NATIVE CLIENT
Create symmetric sprites: browse, save to PC, or store online
c# lua bind with unity3d project for game development
Free strategy browsergame engine.
Modular Gaming Open Source Persistent Browser Based Game Framework
TurboSphere is an easy to learn and powerful JS based game engine.
3D Interactive sandbox environment
AMOS BASIC reimplementation in Java
Make games with Lego-like building blocks
Atlarius is no longer under development.
Andruill Engine is a GMS (Game Management System) written in PHP.