Lurchr - Saves all your Slack links, so you can focus on work
Tettra - Tettra is a company wiki that helps teams manage and share organizational knowledge.
Slack News Feed - Get the top posts from every Slack chat you're in.
Slack It - A bookmarklet to share links in Slack with one click
Slinky - Your slack links — organized!
Photostash - Automatically save your pictures from Slack to Gdrive