Free VOIP / SIP phone. Use your PC as a phone. Works with any SIP/ VOIP provider/ phone service. Easy to use interface to transfer, forward calls or set-up conference calls. Free download from http://www.3cx.com

Express Talk is software that works like a telephone to let you make calls from your PC. With Express Talk you can call anyone on the internet who has installed Express Talk (or any other SIP voip softphone). Calls are free.

VoIP service software for pc to phone voice calls, mobile voip calls, web calls, and click to call from browser. VoIP service also include US & Canada phone numbers, local phone plans, long distance and international calling plans.

YateClient is an universal, skinnable VoIP client which supports H.323, SIP and IAX based on the GTK library.

VOIP Phone Buddy for Skype adds automatic telephone dialling to almost any windows application, using SKYPE and Jajah VOIP telephony, including Microsoft CRM, Microsoft, Access, Microsoft Outlook, Goldmine, ACT, other CRM and Accounts packages etc.

Fax Voip T38 Fax & Voice - Fax and Answering Machine for your SIP Network. Support for Multiple SIP Registrations. Call Routing. Voice Fax Modem for your Fax & Voice soft. Faxes to e-mail as tiff or pdf files. Sending faxes from e-mails.

Encrypt all existing VoIP ATA/IP phone/SIP phone to bypass VoIP blockage.

Free VoIP fax plug-in - connects the fax software already in Windows ("Microsoft Fax" and "Windows Fax & Scan") to your phone line via local VoIP gateway.