On Friday, August 13, 2010, details started to emerge relating to the discontinuation of the Open Solaris project and the pending release of a new closed-source, proprietary version of Solaris, Solaris 11.
Open Solaris was based on Solaris, which was originally released by Sun in 1991.
However, rather than being based around the OS/Net consolidation like Open Solaris was, Open Indiana became a distribution based on illumos (the first release is still based around OS/Net).
There was a post confirming the leak posted to the Open Solaris Forums on August 13, 2010.
Upstream contributions will continue through a new Oracle web site, downstream source code publishing will continue, binary distribution will continue under the old Solaris Express model, but release of source code will occur after binary cuts, and binary cuts will become less frequent.
Open Solaris was developed as a combination of several software consolidations that were open sourced subsequent to Solaris 10.
It includes a variety of free software, including popular desktop and server software.
DTrace was released under the CDDL on January 25, 2005 on the newly launched website.
The bulk of the Solaris system code was released on June 14, 2005.
Sun submitted the CDDL (Common Development and Distribution License) to the OSI, which approved it on January 14, 2005.
The first part of the Solaris code base to be open sourced was the Solaris Dynamic Tracing facility (commonly known as DTrace), a tool that aids in the analysis, debugging, and tuning of applications and systems.
On November 12, 2010, a final build of Open Solaris (134b) was published by Oracle to the /release repository to serve as an upgrade path to Solaris 11 Express.
Oracle Solaris 11 Express 2010.11, a preview of Solaris 11 and the first release of the post-Open Solaris distribution from Oracle, was released on November 15, 2010.
Open Solaris is a descendant of the UNIX System V Release 4 (SVR4) code base developed by Sun and AT&T in the late 1980s.