[jfim]

Hadn't heard of jj, it's a source control tool that advertises that it's fast and compatible with the git on disk format. https://github.com/jj-vcs/jj

[latexr]

Lots of discussion about it on HN if you want to explore more.

https://news.ycombinator.com/item?id=36952796

https://news.ycombinator.com/item?id=30398662

https://news.ycombinator.com/item?id=45083952

https://news.ycombinator.com/item?id=44641961