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.
AddToAny - Share buttons by AddToAny, the universal sharing platform for websites and apps.
ShareThis - Grow your audience with easy-to-use sharing tools.
Shareaholic - Shareaholic is trusted by over 300000 brands, businesses, agencies, and individuals to grow website traffic and engagement 24 hours a day, 7 days a week.
AHAthat - AHAthat increases the influence by SHARing curated content (FOR FREE) and by AUTHORing the social media enabled book.
Pluso - Pluso is a social sharing tool.