I write this as a paying member of the Codeberg e.V., just so you know where my affiliation lays.
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https://sr.ht/ is also reasonably popular, although the web interface is certainly a lot more minimal. SourceHut development and hosting of that instance and lots of other stuff is spearheaded by Drew DeVault. I have my disagreements with the guy technologically, but he holds solid views ethically, so passes the vibe check for me.
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https://notabug.org/ has also been around for quite a few yeaes, and hosted by the https://peers.community/ non-profit. Alas:

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Disroot also has a Forgejo instance: https://git.disroot.org/
Disroot is a community kind of pursuing decentralization and privacy online. Also been around for quite a few years by now.
