[innocenat]

BitBucket was Mercurial-only for quite some times before they added Git (when it was obvious that Git was winning).

I think Google Code provide both from the early day (along with Subversion), and maybe also SourceForge.

[pseudalopex]

SourceForge added Git, Mercurial, and Bazaar in 2009. Google Code added Mercurial in 2009. Bitbucket and Google Code added Git in 2011.

[jamesdwilson]

I've used them all and Bazaar is my fav by far.