Lowdown - Lowdown unleashes the valuable content locked within Slack and emails it to your members so they don't miss key information.
Tettra - Tettra is a company wiki that helps teams manage and share organizational knowledge.
Scrumbot - A summary of all team data in Slack before your daily scrum
Slinky - Your slack links — organized!
Marketplace Hacks - A slack community of marketplace founders & operators
Obie.ai - Access knowledge quicker without leaving Slack