I want to install RedHat 5 Enterprise Edition server on my home PC. I will install servers and clients on virtual machines using Virtual box and study server-client structure at home. But RedHat EE is not free. Instead, I will install a linux server distribution similar to RedHat 5 EE. But I don't know which one is most similar. I know that Fedora is based on RH but it doesn't have a server edition. What are my options?
Centos is basically RHEL recompiled from scratch, and i believe their version numbers are identical to their RHEL counterparts - Its commonly used as a replacement for RHEL. You might also want to consider scientific linux, which is another RHEL derivative, and is almost identical.
RHEL has archives of quite a few versions in the 5.x family, while SL has 5.7