[Ironchefpython]

You might be thinking about fossil. Every feature is in-repo.

https://fossil-scm.org/home/doc/trunk/www/index.wiki

[carlmr]

That looks really cool. Is anybody already using this?

[rkeene2]

Well, SQLite is using it of course ;-)

Other large projects include Tcl/Tk and many related extensions, as well as all the cool stuff I write:

http://chiselapp.com/user/rkeene/