KorGE Game Engine. Multiplatform Kotlin Game Engine & Korlibs
A fresh & lightweight javascript game engine
The Tiny JavaScript Game Engine That Can!
GemRB is a portable open-source implementation of the Infinity Engine
Game engine supporting many 3D/2D formats and graphic effects
Orx: Data-Driven Game Engine
Embeddable unity game engine view for Flutter
3D C++ Game Engine - yet another open source game engine
2D Game Engine
2D Game Engine with Lua Scripting made on top of SFML
KlayGE is a cross-platform open source game engine
A fast, scalable, distributed game server engine/framework for C++
Game engine supporting many 3D/2D formats and graphic effects