CTFs as you need them
Open source library for N64 development
Self-hosted CMS platform based on the Laravel PHP Framework
Open source library for creative expression on the web, desktop, etc.
PyCAPGE - Python Classic Adventure Point and Click Game Engine
Source code of the chapters of the book 3D Game Development with LWJGL
Multidocument automation by templates - for sphinx, mkdocs, epydoc ...
Open-source, cross-platform, C++ game engine for creating 2D/3D games
3D .NET engine for Windows, Linux, Mac
Multimedia asset management and manipulator for Étoilé
a game library to develop audio games
C++ Framework for slot machine games
Pear3DEngine is a modern and modular 3D development framework
An extensible development framework for roleplay games.
Moteur de jeux de rôles descripifs (RP) en PHP
A cross-platform OpenGL based lightweight scenegraph library
The Lambda-Engine is a cross platform game engine.