Multi-platform 2D and 3D game engine
Cross-platform game engine in Rust
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
The ioquake3 community effort to continue supporting/developing id's
The HTML5 Creation Engine
Zig game engine & graphics toolkit
High performance UI layout library in C
2D JavaScript Physics Engine
A simple cross-platform game engine for creating old-school 2D games
Game engine supporting many 3D/2D formats and graphic effects
Descent 3 by Outrage Entertainment
Amateur 3D Game Engine
Orx: Data-Driven Game Engine
Full featured MUD server with all the trimmings.
API (C#) for simulating certain aspects of a ZX spectrum for porting.
Here we're trying to create the easiest open-source game engine.
Svelto ECS C# Entity Component System
Tools and Z80 engine for creating adventure games. (RUST)
PyCAPGE - Python Classic Adventure Point and Click Game Engine
Free, open source game engine online
Haskell game engine library for roguelike dungeon crawlers
The multiplayer game engine
Vivid3D is an open-source 3D engine with powerful 2D UI.
Modified source engine (2017) developed by valve and leaked in 2020