As a default feature
The RevisionSlider adds a slider to the diff view, so that you easily can navigate between the revisions. As of May 17, 2017, RevisionSlider is a default feature on all wikis.
The Advanced Search extension is making hidden existing search options accessible for everyone.
If a footnote is referenced multiple times, highlight the link in the footnote section that brings you back to your original reading position.
A confirmation prompt that prevents users from accidentally clicking the rollback instead of the thank you link.
Overview on the projects shipped in 2016 and 2017.
As a beta feature / partially shipped
With the FileImporter, locally stored files can be moved to Wikimedia Commons including the correct version history.