CTFs as you need them
Gideros Release version
Arianne is an engine to develop multiplayer online games like Stendhal
SDL based generic 2D game engine
lua dev plugin for unreal engine 4 or 5
A cross platform Lua based game engine
IRB is a game creation toolkit
3D .NET engine for Windows, Linux, Mac
Multi-threaded 2D Renderer licensed under the Mozilla Public License
2D Game Engine, based on OpenGL and focused on Isometric Games