BitBucket

​http://bitbucket.org/

BitBucket is a Mercurial repository hosting service with a project view similar to Trac in spirit.

As they say:

Develop code as a team. Keep all your development in one place, be it issue tracking, documentation or sharing code.

Lots of good stuff to steal there ;-)

Among other things, they use WikiCreole all over the place, the same way Trac uses its own Trac WikiFormatting everywhere. Furthermore, the wiki is itself stored in a secondary Mercurial repository, much like described in TighterSubversionIntegration#Aprivaterepository.

Note that we maintain an official Mercurial mirror of the SubversionRepository there, see ​edgewall/trac.