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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