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30 Day free trial of Red Hat Enterprise Linux. It is the leading platform for open source computing. For businesses, governments, or other users looking for stable, supported, and certified Linux.
It is sold by subscription, delivers continuous value and is certified by top enterprise hardware and software vendors. From the desktop to the datacenter, Enterprise Linux couples the innovation of open source technology and the stability of a true enterprise-class platform.

Based on the Linux 2.6.18 kernel.

Link will take you to the subscription form to apply for a 30 day free trial.