This suite of open source tools is the software development platform you've been waiting for. We've taken the wisdom of the most successful open-source communities and turned it into a platform of efficient engineering tools.

Absolutely no tracking or advertising
All features work without JavaScript
The fastest, most lightweight software forge
100% free and open source software
Sourcehut is currently (2020-09) available as a public alpha.
Note that it includes a Plan9(front) continuous integration service
https://sourcehut.org/blog/2020-05-11-sourcehut-plus-plan-9/

Recommended by Brett Gilio
https://brettgilio.com/posts/2020-10-01-why-self-host.html

Found via a link to https://tonsky.me/blog/disenchantment/
on Brett Gilio's article
https://brettgilio.com/posts/2020-07-27-intro-and-computing.html#fn.2

Nikita's article about git is interesting, though a bit old. Note that Fossil implements a web- based GUI.