Firesong - Giphy for Music in Slack w/ Emoji Search
Parallel - Listen to music with friends over Spotify at the same time
Slack Meme Bot - Spice up your team conversations with memes
Slackbox - Spotify playlist collaboration through Slack
VixT on Slack - The best video mashup app now on Slack.
Join My Playlist - Listen to music live together with your friends in Spotify.