Ambassador - Referral Automation, Made Simple.
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.
Referral Candy - Run a fully automated, customizable and easy to integrate referral program for ecommerce.
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.
Viral Loops - Viral Loops is a viral and referral marketing platform to launch ranking competitions, sweepstakes, pre-launch and referral programs.
AddToAny - Share buttons by AddToAny, the universal sharing platform for websites and apps.