TortoiseGit (https://tortoisegit.org/) added basic support for git-svn in release 0.8.1.0:
The release log says:
Add Basic Git-SVN Operation:
-
Add SVN DCommit Command
-
Add “SVN Rebase” and “SVN DCommit”
command at shell contextmenu -
Support Git svn-clone at clone
dialog.