Lest we forget, Mercurial was offered as the other solution to the Bitkeeper problem, as mpm was a kernel hacker at the time. It got a usable UI at version 0.1, two weeks after the git announcement. Some git users relied on cogito for another year or so, as simple things like `git-commit` still had to be manually handcrafted out of `git-commit-tree`.<p>I wasn&#x27;t there to witness this, but I repeat it because it&#x27;s actually kind of hard to dig up this history. I don&#x27;t know of a single place that neatly chronicles the whole transition from bitkeeper -&gt; git&#x2F;mercurial.