I’m pumped a search for hg+mercurial had hits in this thread. I am and will continue to be completely blown that hg lost the dvcs wars. It’s a better tool.
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Hosting is available at least from Sourcehut and heptapod.host.
I'm running a private Heptapod instance (Gitlab fork with direct Mercurial support). It just works.
Sourceforge, Sourcehut, and GNU Savannah all support Mercurial.