trixbox (formerly Asterisk@Home) is a software PBX based on Asterisk.
trixbox was initially released under the name Asterisk@Home. In October 2006 it was renamed to trixbox after Digium requested that its developers cease the use of the word "Asterisk"; the renaming was further justified by the fact that the product at that time consisted of much more than just Asterisk.
Read more about Trixbox: Core Technologies, Similar Software Distributions