Bookmark OS - Bookmark OS is like Mac or Windows optimized for bookmarks.
Votum for Slack - Crowdsourced lists with upvotes, inside Slack
Raindrop.io - All your articles, photos, video & content from web & apps in one place.
Must-Read for Slack - Build controllable must-read lists for your team in Slack.
Siimpl Bookmarking - Start collecting and organizing what interests you
Corpus - Curate, take notes and share your reading list