Slack Meme Bot - Spice up your team conversations with memes
TrackStack - Easy Spotify playlist sharing and collaboration
GoGifApp - Free Slack GIFs App, multiple images to pick from at once
Playlist Machinery - Tools that help you create & organize your Spotify playlists
VixT on Slack - The best video mashup app now on Slack.
Slackbox - Spotify playlist collaboration through Slack