OneBar - AI-powered Q&A knowledge base for Slack teams
Tettra - Tettra is a company wiki that helps teams manage and share organizational knowledge.
Whatis - Manage & organize your team's knowledge straight from Slack
Slack It - A bookmarklet to share links in Slack with one click
Linen - Business Tools, Collaboration, and Slack Tools
PigeonBot - Send emails via Slack with the /email command