VixT on Slack - The best video mashup app now on Slack.
GitHub Visualizer - Enter user/repo and see the project visually
Slack Meme Bot - Spice up your team conversations with memes
Github Profile Visualizer - Tool for visualizing GitHub profiles
GoGifApp - Free Slack GIFs App, multiple images to pick from at once
The GitHub Matrix Screensaver - Latest commits from GitHub visualized Matrix-style