Firefox Advance - Experimental recommendation engine built into Firefox
Harken - Flashcard app using smart repetition to improve your memory
Actually Read It Later - Save articles for reading later
Instapaper - Instapaper is a simple tool to save web pages for reading later.
ShareIt by SocialPilot - Free Content Curation and Influencer Discovery Tool
Pocket - When you find something you want to view later, put it in Pocket.