For the BlueSpice distribution ...
* we have got ~90 active repos hosted on WMF Gerrit and another ~10 in our internal Gitlab
* we want to develop as much as possible on the public infrastructure of the WMF, so the remaining internal repos will (hopefully) be published in the future
Note that any public Git repo would suffice for the purposes of this proposal.
The Codesearch tool mainly used for this in practice, already indexes various third-party hosted Git repositories,
including some hosted on GitHub.com, for example.
You can file a task for additional repos to be indexed:
-- Timo