1. CentOS
Built around the Redhat architecture, CentOS is a free and open-source community-developed Linux distribution that provides an enterprise-level computing platform. Initially released in 2004, CentOS is an excellent free alternative to the enterprise RHEL operating system.
2. Fedora
Fedora is the upstream community distribution for RedHat Linux.
3. Oracle Linux
Oracle Linux is an enterprise-level operating system that is 100% binary compatible with Red Hat Enterprise Linux. 
4. ClearOS
A common challenge facing many small businesses is complexity in deployment. Granted, Linux has made tremendous strides with regards to providing easy-to-use and user-friendly distributions.

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