The https://standardebooks.org/ project has been rebuilding ebooks (open ePUB format) with an eye on quality and readability on mobiles/tablets (fonts, copyedit, etc.) which might be of interest, all books and the website revision are tracked in git.
I'm a big fan of standardebooks! They're doing fantastic work producing better ebooks from Project Gutenberg sources.
Me too! GITenberg started with a variety of goals, some of which were achieved, and others which were less so. Outstanding, considered as a prototype. Standard Ebooks has been much more successful at creating a community working to improve the quality of PG-derived ebooks. We're on the same team.