Stride (formerly Xenko), a free and open-source cross-platform C# game
The HTML5 Creation Engine
A game engine powered by python and panda3d
An easy to use 2D HTML5 game engine written in TypeScript
Recreation of the classic Grand Theft Auto III game executable
Solar2D Game Engine main repository (ex Corona SDK)
Free, cross-platform 2D game engine powered by Haxe and OpenFL
The ioquake3 community effort to continue supporting/developing id's
The flexible game engine
Cross-platform game engine in Rust
Zig game engine & graphics toolkit
3D Procedural Game Engine Using OpenGL
Free game engine for development of desktop, mobile, and web games
Descent 3 by Outrage Entertainment
A game framework written with osu! in mind.
2D JavaScript Physics Engine
Game engine supporting many 3D/2D formats and graphic effects
The multiplayer game engine
A cross-platform, open-source, pure C game engine for mobile game
Engo is an open-source 2D game engine written in Go
Retro game engine for creating games like it's 1997
A fork of dhewm3 with an emphasis on modernisation and vanilla Doom 3
Go 3D Game Engine
KlayGE is a cross-platform open source game engine
A cross-platform 2D game engine