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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.

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

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