Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
Magic Playlist - Get the playlist of your dreams based on a song
AprilZero - A personal dashboard with a lot of metrics and an amazing UI
Spotalike - Spotify playlist with similar songs, according to Last.fm
Sherbit - Sherbit lets you visualize stats on your life based on the services, devices and apps you use.
Spotify - Map shows when two people play same song at same time