Clearbit for Slack - Send all signups directly to a Slack channel
Lurchr - Saves all your Slack links, so you can focus on work
Google Drive to Slack - Slack notifications whenever you work on Google Drive docs
Tettra - Tettra is a company wiki that helps teams manage and share organizational knowledge.
MovetoSlack - Migrate from MS Teams to Slack in 5 minutes
Slack News Feed - Get the top posts from every Slack chat you're in.