There's gerrit.wikimedia.org, and it is mirrored to github.com/wikimedia. Not sure how you can get a sense of how plausible a self hosted veresion of this is fr

There's gerrit.wikimedia.org, and it is mirrored to github.com/wikimedia. Not sure how you can get a sense of how plausible a self hosted veresion of this is from that though :) The mediawiki.org page you linked is the best resource for that.