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ClearOS logo.png
OS familyUnix-like
Working stateCurrent
Source modelOpen source[1]
Latest release7.8.0[2] / June 23, 2020; 4 months ago (2020-06-23)
Kernel typeMonolithic kernel (Linux)
Default user interfaceWeb user interface
LicenseGPL, and others

ClearOS (also known as the ClearOS System, formerly ClarkConnect[3]) is an operating system marketed by the software company ClearCenter. It is based on CentOS and Red Hat Enterprise Linux,[4] designed for use in small and medium enterprises as a network gateway and network server with a web-based administration interface.[5] It is positioned as an alternative to Windows Small Business Server.[6] ClearOS succeeds ClarkConnect. The software is built by ClearFoundation, and support services can be purchased from ClearCenter.[7] ClearOS 5.1 removes previous limitations to mail, DMZ, and MultiWAN functions.[8]

As of the ClearOS 6.1 release, the distribution is a full-featured operating system for gateway, network and servers built from source packages for Red Hat Enterprise Linux.[9][10][11]


Features include:[12]

Awards and recognition[edit]

  • August 2009: CompTIA Breakaway — ClearCenter's ClearOS wins 'Best New Product' at CompTIA Breakaway.[13]
  • August 2010: CompTIA Breakaway — ClearCenter's ClearOS repeats win for 'Best New Product' at CompTIA Breakaway.[14]
  • July 2012: Softpedia — An Open Source, free and powerful network and gateway Linux server operating system[15]
  • February 2014: IDG Security Firewall Distributions Review[16]
  • June 2015: Small Business Computing — The 5 Best Linux Servers for Small Business[17]
  • September 2015: LinuxVoice Service Distro — Group Test (see pages 58-63)[18]

See also[edit]


  1. ^ "ClearFoundation SVN".
  2. ^ "ClearOS Server 7.8 Community Edition Released". ClearOS. ClearFoundation. 2020-06-23.
  3. ^ A Linux server OS that's fiddly but tweakable • The Register
  4. ^ "DistroWatch: ClearOS".
  5. ^ "ClarkConnect Is Now ClearOS".
  6. ^ "Linux answer to Windows SBS: ClearOS".
  7. ^ "Overview". ClearCenter.
  8. ^ "Dual WAN Clarkconnect Community". Archived from the original on 2011-07-08. Retrieved 2010-10-03.
  9. ^ "DistroWatch: Development Release - ClearOS 6.1 Alpha 1".
  10. ^ "ClearFoundation: ClearOS Core 6.1 Alpha1".
  11. ^ Linux Small Business Server Distros » Linux Magazine
  12. ^ The Small Business Server Replacement is Clear(OS) | Linux Magazine
  13. ^ "Breakaway 2009 Best New Product Winner - ClearCenter".
  14. ^ "Best of Breakaway 2010 Awards".
  15. ^ "An Open Source, free and powerful network and gateway Linux server operating system".
  16. ^ Mills, Ashton. "Security firewall distributions". IDG (CSO Online).
  17. ^ Schroder, Carla (June 22, 2015). "The 5 Best Linux Servers for Small Business".
  18. ^ "Server Distros Group Test" (PDF). LinuxVoice Magazine. LinuxVoice. Archived from the original (PDF) on 2016-08-22.

External links[edit]