Free open-source 3D application framework

PixelLight is an free open-source framework that allows you to create 3D
applications easily. As a cross-platform library it is designed to create
desktop applications for several platforms. Due to its modular design,
it is suitable not only for games, but for any kind of 3D applications like
e.g. product presentations or simulations.

Screenshot collage

PixelLight is using OpenGL to enable platform-independence.