RightGIF - Less noise, better GIFs. A better /giphy for Slack.
Playlist Machinery - Tools that help you create & organize your Spotify playlists
Remixatron - Infinite Jukebox on the command line in Python.
Heartbeat - Listen to music with your friends together, on Spotify
GoGifApp - Free Slack GIFs App, multiple images to pick from at once
Partyhero - Pass your friends the aux!