Ct.js is a desktop game engine that makes learning programming fun
Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
The game engine for everyone
Open source library for creative expression on the web, desktop, etc.
Svelto ECS C# Entity Component System
Tools and Z80 engine for creating adventure games. (RUST)
Game engine supporting many 3D/2D formats and graphic effects
C++ lightweight cross-platform game engine
Vivid3D is an open-source 3D engine with powerful 2D UI.
Spring is a free RTS engine developed for Windows, Linux and Mac OS X.
Free and Open Game Programming Language for Windows and GNU/Linux
scriptable game engine with built-in support for 2D graphics and sound