Apptha Social Login - Apptha Social Login is a Magento extension that allows eCommerce store customers to login via social network accounts like Facebook, Twitter, Google and Yahoo. There is also a default registration page and login page of the magento e-store.
NASH OS - Nash OS for Modern Ecommerce
Social Login Plugin - With Social Login your users can login, register and comment with 40+ Social Networks. Maintenance Free. Uptime Guarantee. Fulltime devs
Amasty - Choose from 190+ Magento 1 & 2 modules professionally developed by Amasty, a Bronze Magento Partner. We know how to make your store better!
Janrain Engage - Social Login by Janrain
FME Magento Auction Extension - This Magento Auction Extension helps you create your own auction website in minutes!