Suyu is the most popular + actively developed afaik.
https://suyu.dev/
They host their code on their own Forgejo instance:
https://git.suyu.dev/explore/repos
Which is more DMCA proof then Github/Gitlab.
I hope ForgeFed will go into production soon,
then we can synchronize the code in between multiple Forgejo instances in a federated fashion.
https://codeberg.org/forgejo/forgejo/issues/59
Happily been using it for a few years by now.
The enhanced privacy, extension and about:config support are great features to have.