RightGIF - Less noise, better GIFs. A better /giphy for Slack.
GitHub Visualizer - Enter user/repo and see the project visually
Firesong - Giphy for Music in Slack w/ Emoji Search
Gource - Gource is a software version control visualization tool.
Slack Meme Bot - Spice up your team conversations with memes
Programming Languages Influence Network - Visualizing influence relations of programming languages