Rendering and diffing images→
GitHub can display several common image formats, including PNG, JPG, GIF, PSD, and SVG. In addition to simply displaying them, there are several ways to compare differences between versions of those image formats.
3D File Viewer→
Rendering CSV and TSV data→
Rendering PDF documents→
Rendering differences in prose documents→
Mapping geoJSON files on GitHub→
Working with Jupyter Notebook files on GitHub→
When you add Jupyter Notebook or IPython Notebook files with a .ipynb extension on GitHub, they will render as static HTML files in your repository.