Is there something like GitHub, but without big tech involvement, no data collection, no ads, open source, and preferably decentralized (maybe Fediverse or even P2P)?

codeberg is such an obvious choice, i have no idea why people don't immediately switch from GitHub
- They don't allow for private repos, so it's a non-starter for companies unless they want to self-host.
- Because not everyone works on free software (read their FAQ)
- they also have a limit of 100 repos, so I can't even migrate everything I have on github

Check out Forgejo, it's what codeberg uses as far as im aware. They're the only ones even attempting to put the fediverse into git

NOTE: URLs written in italics are unofficial/self-hosted instances of their respective version control systems.

Forgejo (https://codeberg.org/) and Gitea (https://tildegit.org/) are great.
sourcehut (https://sr.ht/) is fantastic, and also offers Mercurial hosting.
source.community (gemini://source.community) is interesting.
Fossil (https://code.rosaelefanten.org/) is also interesting, and doesn't use Git.
Savannah (https://savannah.nongnu.org/) is the version control system used by the FSF and the GNU project. Uses CVS and Git, with ViewVC and cgit frontends. You must make regular commits, otherwise your account may be pruned.

Sourcehut: https://sr.ht/

+1 for Sourcehut

Yes, git.

Selfhosted Gitea ?

Radicle is really worth checking out https://radicle.xyz/

I recently came across another forgejo instance: https://lavaforge.org/. Seems decent.

interesting!

Probably codeberg, or gitea instance somewhere

I run my own Gitea instance at https://git.benetou.fr/ but I admit didn't look much at the federated aspect, yet.

Sadly I just checked https://forum.gitea.com/c/federation/10 and despite few attempts, e.g. https://nlnet.nl/project/Gitea/ and eventually potentially upstreaming via forgejo https://forgejo.org/2023-01-10-answering-forgejo-federation-questions/#will-gitea-also-gain-federation that does not seem to be usable right now.

I'm checking https://forgefed.org/ which I learned about via checking federation on Gitea and it looks nice, in theory, but until I see an actual list of instances federated together I'll just applaud the effort from afar.

FWIW that lead to discussion in https://codeberg.org/ForgeFed/ForgeFed/issues/77

https://radicle.xyz/ is not fediverse, but P2P

Same as in the other thread, I'm going to recommend fossil-scm.org

Works for me.

Fossil requires its own download client (not git) and like the other guy said Forgejo only accepts certain licenses, Gitea is Google which is obviously a no-go.

Gogs abandoned, Kallithea abandoned.

Realistically that leaves GitBucket https://github.com/gitbucket/gitbucket and Tuleap https://docs.tuleap.org/install.html

Gitea is Google which is obviously a no-go.
Please explain how "Gitea is Google"
Can’t edit. Gogs I’m happy to see did receive security fixes 3 months ago. Also Gitea being a no-go…get it, no-go…hahah.
It is good and proper to hate Google services.