GoGifApp - Free Slack GIFs App, multiple images to pick from at once
Invision - Prototyping and collaboration for design teams
VixT on Slack - The best video mashup app now on Slack.
Mockuuups Studio - Fast and easy way to create product mockups on macOS, Windows and Linux.
Slack Meme Bot - Spice up your team conversations with memes
Craftwork - A collection of User Interface resources made by Craftwork