Gizmo

Open Source VoIP project out of SipPhone

• actually, I don't think there's a lot of Open Source, but it does follow Open Standards (like SIP)

http://www.gizmoproject.com/

2009-11-15-GoogleBuysGizmo

http://www.michaelrobertson.com/archive.php?minute_id=177

uses SIP

working with Asterisk

uses ZeroConf

Irritating Call Out purchase rules: If you have more than one Gizmo account you must use a different credit card for each account. You are limited to One Call Out purchase per week. Unused balances will expire 6 months after purchase.