RightGIF - Less noise, better GIFs. A better /giphy for Slack.
Partyhero - Pass your friends the aux!
VixT on Slack - The best video mashup app now on Slack.
Join My Playlist - Listen to music live together with your friends in Spotify.
Slack Meme Bot - Spice up your team conversations with memes
OutLoud Social Jukebox - Control the music with your friends in real-time