X3D is the open-standard format for 3D graphics scenes on the Web.
Xj3D is an open-source Java codebase for the X3D Graphics standard.
HARFANG 3D source code public repository
A Strong and Easy-to-use Single View 3D Hand+Body Pose Estimator
Multimedia asset management and manipulator for Étoilé
A Ruby script to export Google SketchUp scenes as Ogre 3D meshes
A C++ library to easily create GUI-editable objects