RightGIF - Less noise, better GIFs. A better /giphy for Slack.
GitHub Visualizer - Enter user/repo and see the project visually
Slack Meme Bot - Spice up your team conversations with memes
Codeology - Open-source algorithm that visualizes GitHub projects
Yarn for Slack - Drop TV and movie clips into your Slack chats
SyntaxDB - Easily look up programming syntax for multiple languages