Pocket - When you find something you want to view later, put it in Pocket.
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.
Readit - The most feature-complete reddit client on Windows Phone and Windows 10.
Pinboard - Pinboard is a personal archive for things you find online and don't want to forget.
Slicki - The Wiki for Slack. Build documentation from conversation.