Whatis - Manage & organize your team's knowledge straight from Slack
OneBar - AI-powered Q&A knowledge base for Slack teams
Slack-News - Read news from multiple sources within Slack by just typing
Slack It - A bookmarklet to share links in Slack with one click
Tettra - Tettra is a company wiki that helps teams manage and share organizational knowledge.
PigeonBot - Send emails via Slack with the /email command