From Next American City – “We pick the best apps, websites and software for enhancing and improving urban life.” Mostly USA-relevant, but something for everyone under Governance, Getting Around, Living Well and Civic Engagement.
Here’s one I like:
Street Art View
Want to find a Banksy in Brussels? Or share a pic of a beloved community mural in Philadelphia? Street Art View is a collaborative site that tracks street art around the world — from New York to Juarez to Christchurch — using Google Streetview and mobile uploads to create a global map of high-end murals, elaborate graffiti and anything else that strikes the roving viewer as worth sharing. Streetartview.com