CTFs as you need them
A simple and easy-to-use library to enjoy videogames programming
Open source library for N64 development
Desktop/Android/HTML5/iOS Java game development framework
Open source library for creative expression on the web, desktop, etc.
Vivid3D is a C++ IDE/3D engine, with python scripting.
Vivid3D is an open-source 3D engine with powerful 2D UI.
Cinema Enters Game Console
Modern 3D engine and IDE written using C# and C++.
A distributed graph deep learning framework.
Build Cross-platform Applications
3D .NET engine for Windows, Linux, Mac
A game engine written in the D programming language
a game library to develop audio games
3D Game engine
A 3D, fully concurrent game engine
Pear3DEngine is a modern and modular 3D development framework
Powerful html5 & javascript library for creating applications & games.
Cross-platform reimplementation of AMOS BASIC (runtime)
Formerly CraveJs, it's for creating JavaScript applications and games.
A cross-platform OpenGL based lightweight scenegraph library
AMOS BASIC reimplementation in Java