GlTF

glTF (GL Transmission Format; that's confusingly a lowercase l, not an uppercase I, in its mixed-case initialism) is a format for transmitting 3D models and scenes. It has open-source specs that are royalty-free, but claims an unregistered trademark on its name.

File Identification
glTF files can be in a open HTML format or a binary .GLB format.

Specs

 * glTF 2.0 spec
 * glTF 1.0 spec

Samples

 * Many 3D models are in Smithsonian set, in this and other formats
 * glTF Samples

Links

 * Official site
 * GitHub site