Today at Catalyst, Sun EVP John Loiacono announced that they are going to put their single sign-on solution under an open source license. The code won't be available until Q4 2005, but the Web site is up. Quoting from the site:
The site promises a high level architecture document and uses cases in August. Until then, there's not really enough information to know whether this initiative will matter or not.
The goal of Open Web SSO project is to provide an extensible implementation of identity services infrastructure that will facilitate single sign on for web applications hosted on web and application servers. This implementation will offer the following core identity services: