Pocket - When you find something you want to view later, put it in Pocket.
Harken - Flashcard app using smart repetition to improve your memory
Relevance Coin - 1 billion free coins to improve relevance on the web
Instapaper - Instapaper is a simple tool to save web pages for reading later.
Keep Everything - Light & Fast Web Archiver for iOS, OS X.
Raindrop.io - All your articles, photos, video & content from web & apps in one place.