Whatis - Manage & organize your team's knowledge straight from Slack
Slack News Feed - Get the top posts from every Slack chat you're in.
Slack-News - Read news from multiple sources within Slack by just typing
Slack It - A bookmarklet to share links in Slack with one click
Slack Platform News - News and updates from the Slack Platform direct to your team
Tettra - Tettra is a company wiki that helps teams manage and share organizational knowledge.