Blender - Blender is the open source, cross platform suite of tools for 3D creation.
raylib - Cross-platform, open-source game development library in C.
SketchUp - 3D for Everyone
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.
AC3D - AC3D is a 3D software for games, virtual reality and flight simulation, scientific, medical and general data visualisation, rapid prototypes of 3D designs, 3D printing, Google Earth, X-Plane, Second Life and more.
SDL - Simple DirectMedia Layer is a cross-platform multimedia library designed to provide low level...