View 3D models directly on GitHub
Three Hub is an open source Chrome Extension that shows the 3D models from the model files when browsing GitHub.
This extends the native support GitHub launched for stl format a few months ago: https://github.com/blog/1465-stl-file-viewing
Currently only obj formats are supported, however this is by far the most popular 3D format on github, with over 195 thousand files listed against 22 thousand stl files.
The source is released under MIT license, and is hosted on GitHub: https://github.com/danielribeiro/three-hub