Raindrop.io - All your articles, photos, video & content from web & apps in one place.
Pocket - When you find something you want to view later, put it in Pocket.
Tettra - Tettra is a company wiki that helps teams manage and share organizational knowledge.
Diigo - Diigo is a powerful research tool and a knowledge-sharing community
Pinboard - Pinboard is a personal archive for things you find online and don't want to forget.
Instapaper - Instapaper is a simple tool to save web pages for reading later.