Godot is a powerful cross-platform game engine
Open source voxel game engine with support for survival and crafting
Xash3D FWGS engine
The game engine for everyone
The Ren'Py Visual Novel Engine
Voxel game-creation platform with easy modding and game creation
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
Cocos simplifies game creation and distribution with Cocos Creator
New Godot bindings for Swift
A dead simple 2D game engine for Go
Multi-platform 2D and 3D game engine
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
The ioquake3 community effort to continue supporting/developing id's
Real Time Strategy game engine supporting early Westwood classics
Descent 3 by Outrage Entertainment
Recreation of the classic Grand Theft Auto III game executable
dhewm 3 main repository
Open source library for creative expression on the web, desktop, etc.
Cross-platform game engine in Rust
A 2D rigid body physics engine for the web
A refreshingly simple data-driven game engine built in Rust
Stride (formerly Xenko), a free and open-source cross-platform C# game
The Open Toolkit library is a fast, low-level C# wrapper for OpenGL
A game engine with an emphasis on real-time cutting-edge solutions
An OpenGL RTS game engine written in C