AdminsParadise VoIP PBX

Totally free VoIP PBX and Web based Fax Server. Free Enterprise Grade Fax and Voip Server and a full set of features.
Web based administration for the fax server and VoIP PBX, enabling thumbnail previews, archives uploaded server provides a complete VoIP phone system with music, regular conferences, web-based applications, paging, parking, IVRs, and more.

There is a LiveCD so you can burn an ISO and test it, plus a single installation disk that provides automated installation of system on a server.

There are thumbnail previews, as well as flash based tutorials available.

For free.
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Fring

Fring is a mobile Internet community and service that allows you to connect with friends, share experiences and improve their relationship in the Internet obshtnosttaSkype, ICQ, Google Talk, MSN Messenger, Yahoo!, AIM, Facebook, Last FM & SIP).
You're in touch with your friends in real time, using all your favorite online tools for communication in communities.
Management and interactivity in the contact list. Put your connected contact list at the heart of your mobile experience.
You are online all the time from the mobile device.

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DoNaut

Internet phone and instant messenger add-on

Change and add effects to your voice, sound like anything from a big giant to a little chipmunk. Share your favorite music when you calling your friends. Add background sounds and sound effects to your phone conversation. Text to speech, you write, your friends listen. You can also use DoNaut to download free phone signals and sound effects as WAV, MP3 or OGG files. To use with your favorite IM, internet phone software or cellphone.

Internet phone and instant messenger in one
Change and add effects to your voice. Share your favorite music with your friends when they call you. Add background sounds and sound effects to your phone call. Text of the speech. You can also use DoNaut can download for free alerts on your phone. WAV, MP3 or OGG files. To use with your favorite IM, internet phone software or cell phone

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VoIP Traffic Administrator

VTA is a system that enables VoIP Telephony operator to view the status of the talks - and the resulting loss. Traffic information to generate conversations offline. This means that the balance is calculated after the call. If the balance of the operator-partner is lower than the allowed limit, VTA blocks access to its partner's IP address.

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v-Phone Communcation Center

Vphonet - free international calls to any phone.
Vphonet is VoIP Internet Phone, which allows free phone calls, video conferencing, file transfer, call forwarding, answering machine. You can send SMS to all mobile operators worldwide and make calls at low prices. You do not need high-speed Internet connection in order to have quality conversations.
Features: Phone-to-Phone, Phone-to-Vphonet, Profile of the caller, transferring calls, video messages, address book, file transfer.

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Ventrilo

The next step in the evolution of VoIP communications software is Ventrilo 3.0.0.
Ventrilo 3.0.0 is the next evolutionary step of Voice Over IP (VoIP) group communications software. Ventrilo is also the industry standard by which all others are compared, as they try to imitate its features.

By offering - Surround sound positioning of special effects to any user for each channel on a global level or server configuration program - Ventrilo 3.0.0 provides each member the opportunity to fully customize exactly how he wants to hear sounds from other users or events.

Ventrilo is the most preferred by their superior sound quality and minimal use of CPU resources so as not to interfere with daily operations of the computer or during online game. It is also convenient for simple user interface.

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