Tettra - Tettra is a company wiki that helps teams manage and share organizational knowledge.
SlackScreen - Full screen public Slack channel display
Slinky - Your slack links — organized!
Slack News Feed - Get the top posts from every Slack chat you're in.
Obie.ai - Access knowledge quicker without leaving Slack
Aggreto - Aggreto, a powerful social media aggregator tool and UGC platform that allows you content aggregation from multiple social networks (Facebook, Instagram, Twitter, etc.) for your events, website, and brands.