CTFs as you need them
Open source library for creative expression on the web, desktop, etc.
Self-hosted CMS platform based on the Laravel PHP Framework
High-efficiency minimalist C++ wrapper for OpenGL 4.3
PyCAPGE - Python Classic Adventure Point and Click Game Engine
SDL based generic 2D game engine
Arianne is an engine to develop multiplayer online games like Stendhal
TX Library is a tiny graphics library for Win32 written in C++.
Game/Scene Development System
An isometric arcade-style game of skill, puzzles and exploration
Ze Text Adventure game Builder : Create as you play !
Game engine supporting many 3D/2D formats and graphic effects
Lumina is a visual game creation environment for building 3D games.
INSTEAD - Simple Text Adventure Interpreter.
JavaScript framework to build game engines, games, emulators and apps
Updated emulator of Forgotten Realms: Unlimited Adventures
Small lightweight program to customize your keyboard
Java Settlers
2D Game Engine
Modern 3D engine and IDE written using C# and C++.
A cross platform Lua based game engine
A 2D game engine and level editor
A distributed graph deep learning framework.