Sandbox video game with a powerful physics engine
s&box is a modern game engine, built on Valve's Source 2
Cocos simplifies game creation and distribution with Cocos Creator
Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
Voxel game engine in C++ with OpenGL
Cross-platform 2D and 3D game engine with modular architecture
Fast and lightweight JavaScript game engine built on WebGL and glTF
A modular Common Lisp game engine
Multi-platform 2D and 3D game engine
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
Voxel game-creation platform with easy modding and game creation
Stride (formerly Xenko), a free and open-source cross-platform C# game
Gideros Release version
realistic driving simulation + functions for 2D/3D graphics
MIT Licensed Open Source version of Torque3D from GarageGames
An unmodified version of the MMORPG Impressive Title by KovuLKD
Vivid is a modern C++ 3D engine using OpenGL4+
Searching in 3D stages
Spring is a free RTS engine developed for Windows, Linux and Mac OS X.
OpenGL port of the classic 6dof 3D shooter Descent
3D C++ Game Engine - yet another open source game engine
A fast-paced free software rally racing game