Free game engine for development of desktop, mobile, and web games
3D Game engine with editor
3D game engine with lua scripting
Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
Descent 3 by Outrage Entertainment
Spring is a free RTS engine developed for Windows, Linux and Mac OS X.
3D C++ Game Engine - yet another open source game engine
A 2D game engine and level editor
Multi-platform game engine similar to old Megaman with a stage editor
A roguelike game engine/editor
3D Game engine
A Simple Game Engine
cross-platform 2d game engine