OneBar - AI-powered Q&A knowledge base for Slack teams
Lurchr - Saves all your Slack links, so you can focus on work
SkipFlag - AI knowledge base that builds itself from your communication
Slack News Feed - Get the top posts from every Slack chat you're in.
Memonia - Automatic knowledge discovery and sharing for Slack
Tettra - Tettra is a company wiki that helps teams manage and share organizational knowledge.