Slack News Feed - Get the top posts from every Slack chat you're in.
Lurchr - Saves all your Slack links, so you can focus on work
Slack-News - Read news from multiple sources within Slack by just typing
Google Drive to Slack - Slack notifications whenever you work on Google Drive docs
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.