raylib - Cross-platform, open-source game development library in C.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
SFML - SFML provides a simple interface to the various components of your PC, to ease the development of games and multimedia applications. It is composed of five modules: system, window, graphics, audio and network.
MakeHuman - MakeHuman is a free, open source, interactive modeling tool for creating custom 3D human characters.
SDL - Simple DirectMedia Layer is a cross-platform multimedia library designed to provide low level...
Bforartists - Bforartists is a fork of Blender.