There's also "Chisel - Fossil SCM Hosting".

"This service is completely free and run because a service like it should exist."

https://chiselapp.com/

"All public repositories":

https://chiselapp.com/repositories/

I don't know if it has all the GitHub features people may be looking for.

Chisel runs on Flint, "The ISC licensed codebase behind http://chiselapp.com.":

https://chiselapp.com/user/rkeene/repository/flint/index

EDIT: Add "...should exist." sentence from the homepage.