Sharingbuttons.io - Quickly generate social sharing buttons with a tiny performance footprint.
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.
Simple Sharing Buttons Generator - Share to Facebook, Twitter, Google+, and other social networks using simple HTML buttons
Social Share Kit - Library of CSS/JavaScript social 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.
E-MAILiT - Grow your website traffic, download, install, customize and make more money with our free share buttons and easy-to-use web publishing solutions for your website or blog.