Playlist Machinery - Tools that help you create & organize your Spotify playlists
Muzzy - it’s a tiny and gorgeous iTunes companion that lives on your menu bar. For Mac OSX, its free!
Heartbeat - Listen to music with your friends together, on Spotify
SpotiMy - Play/Pause and Next/Previous functions for Spotify directly on your Menu Bar!
Magic Playlist - Get the playlist of your dreams based on a song
Tabler - Admin panel made simple