Mixonomer is a Spotify playlist manager for creating smart playlists. Create mixes with other Spotify playlists and include AI recommendations, playlists are updated multiple times a day. Last.fm integration provides data for listening statistics and visualisation.
I use Mixonomer to create mixes and big genre playlists out of my smaller sub-genre playlists.
Selector is a Spotify listening agent for monitoring what you’re listening to and presenting a dashboard of stats. Display Spotify stats that you can’t typically see in the apps such as the song descriptor, tempo, key and popularity. Connect to Last.fm to present graphs of how frequently you listen to the current track/album/artist.