Twitter Bookmarks - Create shortcuts to your favorite users/tweets on Twitter
Votum for Slack - Crowdsourced lists with upvotes, inside Slack
MyTweetAlerts.com - Like Google Alerts for Twitter
Must-Read for Slack - Build controllable must-read lists for your team in Slack.
Quuu - Quuu is a curated content suggestion platform that connects to your Buffer queue, allowing you to grow a relevant social media following across your entire social landscape.
Corpus - Curate, take notes and share your reading list