A game engine powered by python and panda3d
3D game engine/framework in C, with Luajit and Python bindings now
2D JavaScript Physics Engine
Descent 3 by Outrage Entertainment
High performance UI layout library in C
Zig game engine & graphics toolkit
GemRB is a portable open-source implementation of the Infinity Engine
Game engine supporting many 3D/2D formats and graphic effects
A complete 2D/3D Arcade Game Engine for Browser (Blender compatible)
Orx: Portable Game Engine
The multiplayer game engine
A game engine for console based text games
Web powered cross-platform 3D, WebXR game engine
scriptable game engine with built-in support for 2D graphics and sound
Multi-platform game engine similar to old Megaman with a stage editor
A generic 2D engine for any kind of game
Javascript adventure game engine
The Lambda-Engine is a cross platform game engine.