VixT on Slack - The best video mashup app now on Slack.
Slackmojis - A directory of the best custom slack emojis
Slack Meme Bot - Spice up your team conversations with memes
Discord Emoji - Iconfinder, but for emoji.
GoGifApp - Free Slack GIFs App, multiple images to pick from at once
Emoji Builder - Create your own emoji in no time 💨