Hey,
What reusable things come out of each Wikimedia Engineering project?
The Wikibase software, developed primarily by Wikimedia Deutchland, includes a lot of reusable code. Basically the components listed as "library" on this page: https://www.mediawiki.org/wiki/Wikibase/Components
This decoupling gives us a lot of flexibility and reduces the cost of maintenance, so I'm all for moving further down that road.
Cheers
-- Jeroen De Dauw - http://www.bn2vs.com Software craftsmanship advocate Evil software architect at Wikimedia Germany ~=[,,_,,]:3