Harmony was born as a tool to create and/or modify local files, on the fly, in your browser. Few weeks ago I decided to try to implement a sort of version control system in it. I think it would be cool one day to either use it for personal use or to teach Git concepts in a sandboxed area. Harmony is powered by web assembly and it runs all the git related stuff in-memory.
In this release I brought an initial support for directories and the possibility to checkout to a particular commit