Kiax is a softphone (soft phone, VoIP client) with a simple and comfortable user interface for making VoIP calls to Asterisk PBX. It depends on the iaxclient library to use Asterisk's IAX2 protocol for easy call configuration and audio setup.
WolfPack PBX is self installing package based on Asterisk. It comes packaged with Vtiger, CentOS, MySql, Webmin and a web GUI interface for easy configuration. Sets up in about 1 hour depending on hardware, no additional hardware is required to use.