The HTML5 Creation Engine
High performance UI layout library in C
The flexible game engine
Free game engine for development of desktop, mobile, and web games
Ct.js is a desktop game engine that makes learning programming fun
Cross-platform 2D and 3D game engine with modular architecture
A game engine with an emphasis on real-time cutting-edge solutions
Tools and Z80 engine for creating adventure games. (RUST)
Ze Text Adventure game Builder : Create as you play !
SDL based generic 2D game engine
Pycraft is an open-source, OpenGL based game made in Python
MIT Licensed Open Source version of Torque3D from GarageGames
Mini game engine for games104
State Management and Multiplayer Networking for Turn-Based Games
A 3D, fully concurrent game engine
Java Client + JS/Canvas Server-Side System, with maintained Objects
Zap Engine