Wikimedia Commons is an online repository of free-use images, sounds, and other media files. It is a project of the Wikimedia Foundation.
If you are a Commons user or need to get statistics for a particular user, then you can query the commonswiki DB to get the results.
There are a lot of developer and wiki guides to set up and get started with your first open source contribution. As a beginner, I always found these wikis a bit overwhelming as they suddenly introduce you to a lot of options and projects.
Wikimedia Commons features many images regularly on its main page. As described by Commons,
Featured pictures are images from highly skilled photographers and illustrators that the Wikimedia Commons community has chosen as some of the highest quality on the site.
The Wikimedia Commons Android app is an open-source app created and maintained by grantees and volunteers of the Wikimedia community.
Wikimedia Commons - Android Apps on Google Play
The Wikimedia Foundation is not involved directly in the creation, development or creation of the app.
Am at the Prague pre-hackathon and the guys from Wikipedia UK and Wikipedia Austria gave a session on SPARQL queries. It seems to be a very cool way to get results from Wikidata and visualize it.