Raindrop.io - All your articles, photos, video & content from web & apps in one place.
Tettra - Tettra is a company wiki that helps teams manage and share organizational knowledge.
Pocket - When you find something you want to view later, put it in Pocket.
Obie.ai - Access knowledge quicker without leaving Slack
Slinky - Your slack links — organized!
Pinboard - Pinboard is a personal archive for things you find online and don't want to forget.