humit - A social networking app for music sharing and discovery.
Songstack - Swipe to discover new music for Spotify
Songlink - Share music with anyone.
BandNext - Discover bands that sound similar to artists you already love with BandNext. A single click saves your results to a Youtube playlist.
Son.gg in Slack - Share music with your team in Slack
22tracks - DJ curated Spotify playlists on iOS