RedHat Linux

RedHat 已不再公開釋出版本, 爾後分三個等級出售, 最便宜的也要 USD 179 (約台幣6000, 超貴)

http://www.redhat.com/software/rhel/ws/

Red Hat Enterprise Linux WS
Ideal for all desktop/client needs, including development workstation, power desktop, targeted client applications, and High Performance Computing.

Red Hat Enterprise Linux ES
The solution for small to mid-range servers used for the majority of today's business computing needs.

Red Hat Enterprise Linux AS
The top-of-the-line enterprise Linux, supporting high-end and mission-critical systems, and available with the highest levels of support.