LoginRadius

AddThis is a free way to boost traffic back to your site by making it easier for visitors to share your content. AddThis is also available as a browser add-on …

Google Cloud Connect for Microsoft Office brings collaborative multi-person editing to the familiar Microsoft Office experience. You can share, backup, and simultaneously edit Microsoft Word, PowerPoint, and...

Shareaholic is the simplest way to share, spread, and save interesting webpages via your social networks, email, blogs, IM, and more. Have all your favorite social networking, bookmarking, blogging, and...

OpenID is an open standard that describes how users can be authenticated in a decentralized manner, eliminating the need for services to provide their own ad hoc systems and allowing …

AddThis for eCommerce. Sharing buttons, ROI tracking, social analytics, social rewards, and advanced social apps for online retailers, including Social Login and Discovery Wall.

Janrain provides hosted user management solutions for social login and sharing, single sign-on and social profile storage.

OmniAuth is a flexible authentication system utilizing Rack middleware.

A service that let you share addresses to web pages etc on most of the common used social networks and sites.

HybridAuth A PHP Library for authentication through Facebook, Twitter, Google, Yahoo, MySpace, LinkedIn, AOL, Vimeo, FourSquare, OpenID and other Identity providers

OAuth is an open standard for authorization. It allows users to share their private resources (e.g. photos, videos, contact lists) stored on one site with another site without having to …

Gigya is one of the leading social choice for websites, integrating online businesses with the top social networks such as Facebook, Twitter and LinkedIn and consolidating the most powerful social …

The Social Login Plugin is a professional though free WordPress (BuddyPress compatible) Plugin that allows your visitors to comment, login and register with social networks like Twitter, Facebook, LinkedIn, or...

Janrain Engage (formerly RPX) enables you to quickly register and login users on your site via their existing Facebook, Google, Yahoo, Twitter, or OpenID accounts. Import rich user profile data, …

Janrain Engage is a plugin for WordPress allowis users to easily register and login via an existing account with Facebook, Google, Twitter, Yahoo!, LinkedIn and other social platforms. Users also …

Lanoba bundles Facebook Connect, Twitter, Google, LinkedIn, Hotmail, Live, OpenID, MySpace and Yahoo into a unified login Javascript API with complete demographic analytics and social sharing for viral...

Place a button on your site or application which allows Twitter users to enjoy the benefits of a registered user account in as little as one click. Works on websites, …

WP-FB-AutoConnect is a simple wordpress widget that lets readers login to your blog with either their Facebook account or local WordPress credentials. Full support for both WordPress and Buddypress.