Pluso - Pluso is a social sharing tool.
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.
ShareThis - Grow your audience with easy-to-use sharing tools.
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.
AddToAny - Share buttons by AddToAny, the universal sharing platform for websites and apps.
Uptolike - Uptolike allows you to set the buttons of social networks in one click.