- German federal law and regulations: https://github.com/bundestag/gesetze
- DMCA takedown notices: https://github.com/github/dmca
- Map of US districts: https://github.com/benbalter/congressional-districts
- a novel: https://github.com/JJ/hoborg
- a well-known textbook on some niche (homotopy type theory) in mathematics: https://github.com/HoTT/book
- fonts: https://github.com/theleagueof
- Gregorian chants: https://github.com/CMAA/nova-organi-harmonia
Main collaboration functions on a 'repository' (or any set of data / documents that somehow belong together) such as forking and branching are not just only relevant to programming.
(edit: formatting)
- Remote job information: https://github.com/lukasz-madon/awesome-remote-job
- Liberland constitution: https://github.com/liberland/constitution
My favorite example of a "non-programming" project is Hadley Wickham's Advanced R book (http://adv-r.had.co.nz) which is hosted on GitHub and powered by Jekyll, knitr, and pandoc. I hope more authors decide to publish this way.
https://www.google.com/webhp?sourceid=chrome-instant&ion=1&e...