Alongside the Google Maps Wikipedia layer and our iOS nearby articles feature (correct?), the Android/iOS app Geoloqi now has a Wikipedia layer.
Geoloqi is pretty cool. It has some cool geo features you can tack on to your apps too:
https://developers.geoloqi.com/ in addition to its own feature set. (If anybody wants a contact, I know the founders.)
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Steven Walling
Community Organizer at Wikimedia Foundation