Sun had released Open Solaris about a year and a half ago ,under CDDL license; It is probably going to be changed soon to GPLv3 (See: http://www.linux-watch.com/news/NS8979755794.html).
This is a general overview lecture about Open Solaris. We will deal with Open Solaris open source model (with comparison to linux), Open Solaris pros and cons , solaris zones and solaris streams, solaris-linux interoperability, and more.