Retro game engine for creating games like it's 1997
Open source reimplementation of GTA San Andreas game engine in Unity
Opensource crossplatform Fallout 2 game engine writen in C++ and SDL
Every creative journey starts with Unity Hub
A modern, cross-platform Quake game engine based on FitzQuake.
GemRB is a portable open-source implementation of the Infinity Engine
Orx: Portable Game Engine
An isometric arcade-style game of skill, puzzles and exploration
A free 3D game engine to create games and realtimes scenes for Windows
Full featured MUD server with all the trimmings.
Cross-platform 2D game engine (+ full OpenGL, +full OpenGL ES )
Game engine supporting many 3D/2D formats and graphic effects
Pycraft is an open-source, OpenGL based game made in Python
Game/Scene Development System
A fork of Chocolate Doom with small Quality of Life enhancements
A simple tool to allow Chessmaster 10/11 bot customizations
Vivid3D is an open-source 3D engine with powerful 2D UI.
A conservative source port of Heretic that is identical to DOS
ZDoom 2.8.1 fork focusing on modernisation, performance and stability
A Tile-based Game Engine written in C# mimicing retro consoles.
A game engine for console based text games
A conservative source port of Hexen that is identical to DOS