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Allow your site's users to use one of their accounts at Facebook, Google, Twitter or Linked in to log into your site.

With Janrain, websites allow users to login with their existing account from Facebook, Twitter, Google, Yahoo!, LinkedIn and other social platforms, and share user activities with friends on multiple social networks.

Janrain Engage also enables websites to import rich user profile information, friends and social graphs to offer a more personalized user experience. Janrain Federate enables single sign-on for organizations with multiple websites. Janrain Capture enables storage of rich user profile data to help build personalized and engaging online experiences.

A Leading OpenID provider

OAuth is an authorization standard which allows you to grant partial/selective access to your private resources on another site, without sharing your passwords.

While OpenID is all about using a single identity to sign into many sites, OAuth is about giving access to your stuff without sharing your secret resources (password).

http://oauth.net/about/

Identity and Access Management for Enterprise cloud apps

Clients include Yammer (founder and CEO David Sacks is an investor)

TechCrunch article states:

OneLogin allows enterprises of all sizes to centralize access control with a single login for business applications. OneLogin has integrated with over 1,700 applications including Salesforce, Google Apps, Zendesk, SugarCRM, KnowledgeTree and others to allow business users to access all of their apps within one sign-in and password. Other features include password management, multi-factor authentication, directory integration, and user provisioning.

OpenID is a standard that DESCRIBES how users can be authenticated in a decentralized manner.

OpenID's alternative is SAML.

http://openidexplained.com/

SAML is an open standard created by OASIS for exchanging identity information between an Identity provider and an Identity user (a service that the user is accessing).

SAML's alternative is OpenID

OpenID provider with support for multifactor security

Horizon App Manager from VMware allows companies to manage security and access entitlements for employees to access cloud services, while keeping their passwords and entitlement directories behind the firewall. 

Scoble video

Network computing article