Social Login, Social Sharing allows login, share, comment, register using any social media like Twitter, Google, Facebook, VK. EASIEST to configure.
This is a paid subscription plugin offered by LoginRadius for Social Login and Social Data Integration.
Social sharing features like Social share buttons, social locker & social like altogether. Best social share plugin to increase social traffic
Social Login by Janrain
Customize WordPress login page easily according to your theme or any other custom style with Custom Login Page Styler.
Google Identity Toolkit (GITkit) helps relying party (RP) websites to support federated login easily (http://code.google.com/apis/identitytoolkit).
Provides a simple and very lite social login system for your WordPress without any server overloads !
SeatID Social Solutions Plugin allows you to implement the SeatID widget onto your WordPress website without the need to add or edit any code.