lua dev plugin for unreal engine 4 or 5
An isometric arcade-style game of skill, puzzles and exploration
SDL based generic 2D game engine
2D Game Engine
FreeCS is a free-software reimplementation of Counter-Strike 1.5.
The imaginary eight-bit machine
A cross platform Lua based game engine
8-bit Graphical API for Java
Build Cross-platform Applications
2D ARPG Engine
3D .NET engine for Windows, Linux, Mac
Flexible and easy-to-use 2d game engine
Mahasona engine is an open source game engine.
Free strategy browsergame engine.
A generic 2D engine for any kind of game
Multi-threaded 2D Renderer licensed under the Mozilla Public License
A world editor for HGE game engine written in python and uses OpenGL.
Java game engine for shoot 'em ups, using Java2D.
Framework for a graphical point and click adventure game in Java
AS3 Utilities library (Games Development Framework)
A cross-platform OpenGL based lightweight scenegraph library
Cross-platform 2D game engine