Tribox: Asterisk Free Open Source PBX
Tribox is a community of developers and users who support and extend the Asterisk PBX software suite.
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Trixbox is an Asterisk-based VOIP Phone System, formerly Asterisk @ Home. It enables even a novice user to quickly set up a voice over IP phone system. Trixbox can be configured to handle a single phone line for a home user, several lines for a small office, or several T1s for a million minute a month call center.
Tom Keating writes about Tribox in his VoIP & Gadgets blog:
Tribox is a turn-key, bootable .iso CD image that can turn a PC with no OS into an Asterisk server with a variety of open source tools in just a few minutes. The trixbox application lets someone download a bootable .iso image that then automatically installs Linux, Asterisk, SugarCRM, MySQL, FreePBX, and a whole variety of other applications. Trixbox fully supports the Linux yum command and RPM ecosystem for performing updates and bug fixes.