OpenSolaris
OpenSolaris: What is it exactly?
OpenSolaris, also commonly referred to as osol, is a completely free and open source version of the Sun Microsystems Solaris operating system, licensed under the CDDL. It is also the code base for the up-and-coming Solaris 11.
It is most commonly distributed as a live CD that can be installed to your hard disk in the same way that many modern Linux distros can. It makes use of the Gnome desktop, although others are available. If you want to take it for a spin and get a feel for what it's all about, you can download it here.
Click on the Get It! Link, and you will be directed to the download page.
OpenSolaris: A platform for VistA?
Utilizing a virtualization technology called zones (or containers, which is slightly different), the Linux version of GT.M (and thus VistA) run un-modified. You still have a great deal of the functionality that exists in Linux, in addition to technologies only found in Solaris operating systems. A couple of the most popular and significant are ZFS, and Crossbow.
