CentOS 5 - The Community ENTerprise OS

CentOS is an Enterprise Linux distribution based on the freely available sources from Red Hat Enterprise Linux. Each CentOS version is supported for 7 years (by means of security updates). A new CentOS version is released every 2 years and each CentOS version is periodically updated (roughly every 6 months) to support newer hardware. This results in a secure, low-maintenance, reliable, predictable and reproducible Linux environment.


CentOS is an Enterprise-class Linux Distribution derived from sources freely provided to the public by a prominent North American Enterprise Linux vendor. CentOS conforms fully with the upstream vendors redistribution policy and aims to be 100% binary compatible. (CentOS mainly changes packages to remove upstream vendor branding and artwork.) CentOS is free.

CentOS is developed by a small but growing team of core developers. In turn the core developers are supported by an active user community including system administrators, network administrators, enterprise users, managers, core Linux contributors and Linux enthusiasts from around the world.


Getting help / Documentation
CentOS Tips and Tricks
HowTos
Frequently Asked Questions


Download
Current latest version is 5.5. Although you can download previous versions (versions 3 and 4)  from following links. 
CentOS 5 ISOs | CentOS 4 ISOs | CentOS 3 ISOs


By: Ramkrishna Guchhait