Ct.js is a desktop game engine that makes learning programming fun
Free game engine for development of desktop, mobile, and web games
3D Game engine with editor
KorGE Game Engine. Multiplatform Kotlin Game Engine & Korlibs
Stride (formerly Xenko), a free and open-source cross-platform C# game
The flexible game engine
The Tiny JavaScript Game Engine That Can!
Descent 3 by Outrage Entertainment
A cross-platform, open-source, pure C game engine for mobile game
3D C++ Game Engine - yet another open source game engine
Web powered cross-platform 3D, WebXR game engine
Multi-platform game engine similar to old Megaman with a stage editor
A Simple Game Engine
cross-platform 2d game engine