PC-Telephone
Make FREE pc-to-pc, pc-pc and cheap pc-to-phone, pc-phone, pc-to-fax, pc-fax, phone-to-pc, phone-pc, fax-to-pc, fax-pc calls over Internet/VoIP or ISDN/PSTN telephone networks. Use your computer as internet telephone, USB phone, USB handset, ISDN telephone, ISDN fax, answer phone, fax software,... Works with all Firewalls, NAT and LAN routers - nothing to configure.
http://www.pc-telephone.com/download/pc-telephone.exe - 1Mb - Download - Screenshot

Gizmo Project
Gizmo Project is a free Internet phone for your computer that lets users make crystal-clear free calls using the Internet. As easy to use as instant messaging, calls offer crystal-clear voice quality and PC-to-PC calls are always free. Calls to ordinary landlines and mobile phones are available... Gizmo Project users enjoy high-end features as customizable, free voicemail which is conveniently sent to you via email, free conference calling, free call forwarding, complete call history, free access to millions of people on SIP-based networks, built-in instant messaging (IM) capabilities,...
http://www.gizmoproject.com/GizmoDownload/WinGizmoInstall.exe - 10Mb - Download - Screenshot

VSoft3
The VSoft Phone is a simple to use internet telephone system that can reduce your call costs. It uses the latest technology to let you make calls to friends, family, and business associates anywhere in the world without any chunky telephone equipment. ... VSoft features includes unlimited free VoIP to VoIP call (PC to PC), free video call, low cost VoIP to home/mobile call, send SMS, confrence, SMS to call, VoIP bridge. ... The VSoft Phone utilises a Broadband internet connection to allow a user to make VoIP calls to any phone number worldwide.
http://www.mobif.com.my/Download/VSoft3.3-setup.exe - 4Mb - Download - Screenshot

AccuBell Talking Caller ID
Free 15 Days Trial. AccuBell Talking Caller ID announces the incoming phone call with caller number and identification of local or long distance call. Pop-up window shows callers Name, Number, Date and Time before you answer. Date and Time have region and country choices. ... Call Forwarding feature let you take all incoming call to your Mobile phone during Internet session or when outside home. ... Instantly Zap any unwanted incoming call. ... Ability to save the unwanted callers in a Block List and automatically hang up when any such call arrives.
http://www.accubell.com/Download/Accsetup.exe - 2Mb - Download - Screenshot

vPhonesoft
vPhone is a feature-rich VoIP Internet-Phone software. vPhone customers can download for FREE and talk to each other by voice or video calls, including multi-participant conference calls, send SMS, MMS messages from vPhone to vPhone and from vPhone to any e-mail, completely free! ... Additional features of vPhone allow our customers calling regular and cellular phones worldwide at great rates, sending SMS messages to cellular phones, a built-in answering machine with Web access, and all these exciting features: Voice call PC to PC, Voice call - PC to regular phones, Voice conference - 1+4...
http://www.virtualiphone.com/vPhoneSetup.php - 3b - Download - Screenshot

Call Any Phone any Where Free by Watching Videos
Net Phone has come up with new features. Call Any Phone any Where Free by Watching Videos. Net Phone is a Net based VoIP net phone, which integrates robust technologies such as Net stack by NIST (National Institute of Standards and Technology) and Java, JMF from Sun Microsystems. ... Net Phone offers you a free phone number to make free pc to pc calls and receive free incoming calls from any phone. ... Net Phone is a free downloadable net phone which enables you to make calls from pc to pc, pc to mobile and pc to landline.
http://www.6URL.com/0TSN - 7Mb - Download - Screenshot

FREE PHONE
FREE phone is a SIP based VoIP soft phone, which integrates robust technologies such as SIP stack by NIST (National Institute of Standards and Technology) and Java, JMF from Sun Microsystems. FREE phone is a free downloadable soft phone which enables you to make calls from pc to pc, pc to mobile... FREE phone offers you a free phone number to make free pc to pc calls and receive free incoming calls from any phone. ... The peer to peer Video Call facility enables you to call your FREE phone buddy with live video action in progress.
http://www.globe7.com/downloadnow.php?refcode=AX12640 - 16Mb - Download - Screenshot

Express Talk VoIP Softphone
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. You can also call ordinary telephone numbers anywhere in the world if... Features: ~ Lets you make internet phone calls free direct PC to PC, or PC to phone via a VoIP SIP gateway provider. ... ~ Uses the standard SIP protocol so it can link to a broad range of telephone gateways, SIP system or other internet phone software.
http://www.audiochannel.net/software/talk.zip - 430Kb - Download - Screenshot

Best Phone
Best phone is a SIP based VoIP soft phone, which integrates robust technologies such as SIP stack by NIST (National Institute of Standards and Technology) and Java, JMF from Sun Microsystems. Best phone is a free downloadable soft phone which enables you to make calls from pc to pc, pc to mobile... Best phone offers you a free phone number to make free pc to pc calls and receive free incoming calls from any phone. ... The peer to peer Video Call facility enables you to call your Best phone buddy with live video action in progress.
http://www.globe7.com/downloadnow.php?refcode=AX12640X5555 - 16Mb - Download

soft Phone
soft Phone is a SIP based VoIP soft phone, which integrates robust technologies such as SIP stack by NIST (National Institute of Standards and Technology) and Java, JMF from Sun Microsystems. soft Phone is a free downloadable soft phone which enables you to make calls from pc to pc, pc to mobile... soft Phone offers you a free phone number to make free pc to pc calls and receive free incoming calls from any phone. ... The peer to peer Video Call facility enables you to call your soft Phone buddy with live video action in progress.
http://www.globe7.com/downloadnow.php?refcode=AX12640X1111 - 16Mb - Download - Screenshot