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.
Obie.ai - Access knowledge quicker without leaving Slack
Kifi for Slack - Get links messaged on Slack in Google Search results
Slinky - Your slack links — organized!
Slack It - A bookmarklet to share links in Slack with one click