Firesong - Giphy for Music in Slack w/ Emoji Search
Meme Creator Bot - Create cool memes over a bot
Slackbox - Spotify playlist collaboration through Slack
memade - Amazing memes, made easy. For everyone 🎉
GoGifApp - Free Slack GIFs App, multiple images to pick from at once
Tars - TARS enables users to create chatbots that replaces regular old webforms.