For a limited time, Sun is offering free Solaris DVD software kits. To receive this offer, please fill out the THIS FORM, which includes mailing label details.
Sun Developer Tools and the Solaris 10 Operating System: The most advanced OS on the planet - available for no charge. With industry-leading stability, security,and scalability combined with over [...]

Just like Ubuntu OpenSolaris 2008.05 for x86 is available to use free of charge and we can send you a CD at no extra cost. The delivery time may vary depending on your location, so you should consider downloading the CD image if you have a fast Internet connection.
The OpenSolaris 2008.05 Live CD makes [...]

Linux is a free operating system. You can easily download one in any distribution sites. But Ubuntu is different among other Linux distros, Ubuntu also offers free download but the best thing is you can request Ubuntu CD for free with free shipments across the globe.
Ubuntu is available free of charge and we can send [...]