BlueOnyx is a Linux distribution (based on CentOS v5.6) which aims at delivering a turnkey server appliance for webhosting. It comes with a web based GUI interface which allows you (and your email, FTP and webhosting clients!) to manage most aspects of the server, its sites and accounts through a browser based interface. It is open source software, released under a Sun modified BSD license.
BlueOnyx is a modernized fork of BlueQuartz and has been developed by Solarspeed.net and NuOnce Networks, Inc. and A lot of improvements and enhancements (compared to a regular BlueQuartz) went into BlueOnyx. Including support for Java Servlet Pages, built in web based email, phpMyAdmin for you and your webhosting clients and provisions to automatically create MySQL databases and users for each virtual site.
It is what BlueQuartz could have been in 2007 had development not stagnated. It is "BlueQuartz" on CentOS 5.6 and then some. Has all BlueQuartz updates that accumulated between 2007 and 2009, which never got released or delayed for years. Has previously commercial add ons pre-installed, including ... Brute Force Login detection and prevention mechanisms (pam_abl) phpMyAdmin Web based Email GUI to automatically create and remove MySQL users and databases for sites. Subdomain management Better PHP security management on a per site basis. New default skin for the GUI. Working vacation messages. Updated Dovecot and ProFTPd. JSP support already built in with an improved GUI. YUM updates are delivered through various mirrors right from the start. Is still available free of charge and released under Sun modified BDS license. Comes with PHP5 and MySQL5 preinstalled. GUI to modify SSHd settings (root access, port, protocols) GUI available in English, German, Danish and Japanese. Mailman support instead of Majordomo. "Site Prefix" that allows to prefix usernames with a 5 character string. Better and more flexible "Web Alias" handling.
Migrating from BlueQuartz to BlueOnyx (and back) is possible through the included CMU (Cobalt Migration Utility).