Slack News Feed - Get the top posts from every Slack chat you're in.
SlackScreen - Full screen public Slack channel display
Slack-News - Read news from multiple sources within Slack by just typing
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.
Slack Platform News - News and updates from the Slack Platform direct to your team
Obie.ai - Access knowledge quicker without leaving Slack