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
Stride (formerly Xenko), a free and open-source cross-platform C# game
KorGE Game Engine. Multiplatform Kotlin Game Engine & Korlibs
The Tiny JavaScript Game Engine That Can!
The flexible game engine
Descent 3 by Outrage Entertainment
A cross-platform, open-source, pure C game engine for mobile game
Web powered cross-platform 3D, WebXR game engine
Multi-platform game engine similar to old Megaman with a stage editor