Game engine supporting many 3D/2D formats and graphic effects
Real Time Strategy game engine supporting early Westwood classics
Orx: Data-Driven Game Engine
lua dev plugin for unreal engine 4 or 5
Gideros Release version
SDL based generic 2D game engine
Arianne is an engine to develop multiplayer online games like Stendhal
Old-school 2D game engine
INSTEAD - Simple Text Adventure Interpreter.
Spring is a free RTS engine developed for Windows, Linux and Mac OS X.
Quake PAK file utility
The imaginary eight-bit machine
A cross platform Lua based game engine
8-bit Graphical API for Java
Source code of the chapters of the book 3D Game Development with LWJGL
Portable game engine with main focus on point-and-click adventures
Build Cross-platform Applications
An environment to develop games based on a rectangular board
C/C++ , PHP, PYTHON, 3D ENGINES, CHROME NATIVE CLIENT
Asphyre is a cross-platform framework for Delphi and FreePascal.
3D .NET engine for Windows, Linux, Mac
Flexible and easy-to-use 2d game engine
A game engine written in the D programming language