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.
Kifi for Slack - Get links messaged on Slack in Google Search results
Slack It - A bookmarklet to share links in Slack with one click
Photostash - Automatically save your pictures from Slack to Gdrive
#Clicky for Slack - Post links to Slack with a single click