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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
Free, open source game engine online
An OpenGL RTS game engine written in C
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The Tiny JavaScript Game Engine That Can!
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
Descent 3 by Outrage Entertainment
PyCAPGE - Python Classic Adventure Point and Click Game Engine
A cross-platform, open-source, pure C game engine for mobile game
KlayGE is a cross-platform open source game engine
Web powered cross-platform 3D, WebXR game engine
Multi-platform game engine similar to old Megaman with a stage editor