Where can I get Linux?
From WikiEducator
There are literally hundreds of places you can get Linux because there are hundreds of "versions" or distributions of Linux. If you think you might want Linux because you're considering alternatives to Microsoft Windows or Macintosh OS for everyday computer use, you may want to check out a version of Linux called 'Knoppix', which will boot from your CD drive and does not need to be installed. If you're interested in Linux for other reasons, we invite you to look at our list of Linux distributions. You'll likely find what you're looking for there.
Click here for Detailed information on different distributions of linux