Scm-manager [https://scm-manager.org/]

Phorge https://we.phorge.it/

Also supports Hg.

There is also git-as-svn, which provides access to a git repository through SVN: https://git-as-svn.github.io/git-as-svn/htmlsingle/git-as-sv...

SourceHut, I think.