Songstack - Swipe to discover new music for Spotify
Detour - Immersive audio walks, now in 17 cities
BandNext - Discover bands that sound similar to artists you already love with BandNext. A single click saves your results to a Youtube playlist.
City Walks - A platform that you can virtually wander around the world.
22tracks - DJ curated Spotify playlists on iOS
Virtual Museums - Explore the world's museums, virtually.