Slack News Feed - Get the top posts from every Slack chat you're in.
slackcat - Post command line output directly to Slack.
Slinky - Your slack links — organized!
Memonia - Automatic knowledge discovery and sharing for Slack
Tettra - Tettra is a company wiki that helps teams manage and share organizational knowledge.
Lurchr - Saves all your Slack links, so you can focus on work