We have Git repository statistics on https://wikimedia.biterg.io/ but currently have no idea about our on-wiki developers.
Potentially related links:
- https://www.mediawiki.org/wiki/Special:Gadgets (lists links to code bases)
- https://www.mediawiki.org/wiki/Special:GadgetUsage (shows popularity)
When I once asked anomie about getting usernames of most active Lua template editors across WMF sites, his reply was
The best you might do would be to look at the top editors in the Module namespace on different wikis, although that might as well catch people who make lots of edits to some test module because they have no idea what they're doing or (on smaller wikis) people who copy-paste modules from other wikis.