Firefox Advance - Experimental recommendation engine built into Firefox
AddThis - AddThis free website tools include share buttons, targeting tools and content recommendations help you get more likes, shares and followers and keep them coming back.
Actually Read It Later - Save articles for reading later
Buffer - Buffer makes it super easy to share any page you're reading. Keep your Buffer topped up and we automagically share them for you through the day.
ShareIt by SocialPilot - Free Content Curation and Influencer Discovery Tool
AddToAny - Share buttons by AddToAny, the universal sharing platform for websites and apps.