Open Source OpenSSO for identity management Unveiled by Sun

Organizations of today face problems with respect to Single Sign On or SSO and keeping this in mind the OpenSSO Enterprise software, the first open solution for access management from Sun seeks to address this issue. It aims at offering flexible and scalable solutions for simplifying process of managing user identities across a range of applications.
As of now Sun's OpenSSO Enterprise is the only integrated open source, access and federation management solution available in the market. You can either deploy open source or commercial versions of OpenSSO Enterprise backed by able support from the company.
Take a look at the major components of OpenSSO Enterprise solution:
Access Management with Embedded Directory Server: OpenSSO Enterprise is the only product on the market to feature embedded directory capabilities, allowing customers to deploy OpenSSO Enterprise in minutes without ever having to configure or deploy a standalone directory. In addition to the embedded directory, the new centralized server configuration and centralized agent configuration help reduce the time and cost associated with deploying and maintaining a complex Web access management solution.
Federation: Sun OpenSSO Enterprise offers a multi-protocol federation hub as well as a lightweight, high-speed federation package called a Fedlet, which provides a new way for service providers to federate with an identity provider in minutes without the need for a standalone federation product or infrastructure. Partner support is included under the identity providers license, so service providers do not have to buy an additional federation license – a hidden cost in many other products.
Secure Web Services: OpenSSO Enterprise provides a standardized, repeatable way to secure Web services within an organization. No plug-ins are necessary and developers and integrators can leverage out-of-box tooling by the NetBeans(TM) IDE and the GlassFish(TM) application server. Sun OpenSSO Enterprise also includes a Security Token Service (STS) that centralizes the process of issuing, validating and translating Web service tokens. Moreover, Sun's STS – unlike others – can be deployed standalone to support third-party solutions.
Catch more details out here.