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
SDL based generic 2D game engine
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 ...
Gorgon Game Engine (GGE) is a C++ game engine that handles many tasks.
Multimedia asset management and manipulator for Étoilé
XNA based game engine completely written in c#
AutoTeach makes kids study and learn in exchange for internet access.
a game library to develop audio games
C++ Framework for slot machine games
Pear3DEngine is a modern and modular 3D development framework
Andruill Engine is a GMS (Game Management System) written in PHP.