Seance is a WebOS app that makes it easy to place calls and send text messages, through your mobile phone carrier, that appear to come from your Google Voice number.
This is not a VoIP client. Phone service is required, and calls will use your airtime minutes.
This project has no association with Google.
Seance is a fork of P2GoogleVoice, a product of P2Labs that was abandoned some time around early 2010.