Sharingbuttons.io - Quickly generate social sharing buttons with a tiny performance footprint.
ShareThis - Grow your audience with easy-to-use sharing tools.
AddToAny - Share buttons by AddToAny, the universal sharing platform for websites and apps.
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.
Crazy Egg - Through Crazy Egg's heat map and scroll map reports you can get an understanding of how your visitors engage with your website so you can boost your conversion rates.
Simple Share Buttons - SimpleShareButtons is a plug-in for WordPress that comes with eleven different social sharing button sets.