OpenSSO was an open source access management and federation server platform (SSO acronym stands for Single Sign-On ).
Oracle completed their acquisition of Sun Microsystems in February 2010 and shortly thereafter removed OpenSSO downloads from their website in an unannounced policy change. OpenSSO will continue to be developed and supported by ForgeRock under the name of "OpenAM."
Announced by Sun Microsystems in July 2005, OpenSSO was based on Sun Java System Access Manager, and was the core of Sun's commercial access management and federation product, OpenSSO Enterprise (formerly Sun Access Manager and Sun Federation Manager).
In July 2008, Sun announced paid support for regular "Express" builds of OpenSSO. Sun’s stated intent was that Express builds would be released approximately every three months, allowing customers early access to new features.
In September 2008, Sun announced OpenSSO Enterprise 8.0, the first commercial product derived from the OpenSSO project. OpenSSO Enterprise 8.0 was released in November 2008.
OpenSSO Enterprise won the "Security" category of the Developer.com Product of the Year 2009 awards.
In May 2009, shortly after Oracle's acquisition of Sun was announced, OpenSSO Enterprise 8.0 Update 1 was released.