Desktop/Android/HTML5/iOS Java game development framework
lua dev plugin for unreal engine 4 or 5
Amateur 3D Game Engine
Java Settlers
8-bit Graphical API for Java
Multidocument automation by templates - for sphinx, mkdocs, epydoc ...
2D ARPG Engine
3D .NET engine for Windows, Linux, Mac
Cross-platform C framework very compact libraries and tools.
A generic 2D engine for any kind of game
Open Source Virtual World and MMOG Development Platform
AMOS BASIC reimplementation in Java
Cross-platform 2D game engine
Basic real-time simulation engine in C++
A tools API for designing table top game utilities
The next generation mud is an open-source extensible, programmable mud
An extensible game engine that targets RPGs.
A generic C++ MUD server featuring a strategy-style hexagon map