Playlist Machinery - Tools that help you create & organize your Spotify playlists
Xmind - Xmind is a brainstorming and mind mapping application.
Heartbeat - Listen to music with your friends together, on Spotify
MindManager - With MindManager, flexible mind maps promote freeform thinking and quick organization of ideas, so creativity and productivity can live in harmony.
Magic Playlist - Get the playlist of your dreams based on a song
MindMeister - Create, share and collaboratively work on mind maps with MindMeister, the leading online mind mapping software. Includes apps for iPhone, iPad and Android.