Gizmo Project is a free internet phone software that enables PC-to-PC calls and has affordable rates for calls to ordinary landlines and mobile phones.
One of the best things about Gizmo Project is how many high-end features it offers. For example, you'll get a customizable voicemail that can be conveniently sent to you via email. There's also free conference calling, call forwarding, and complete call history. Plus, you'll be able to access millions of people on SIP-based networks for free.
Another great feature of Gizmo Project is the built-in instant messaging capabilities. You'll be able to see your contacts' online presence status and even get maps to caller locations. Additionally, this app supports the Asterisk PBX and much more.
For a small charge, you can even get a personal "virtual number" that lets people on ordinary phones easily call your computer. Best of all, Gizmo Project runs on Apple Macintosh, Microsoft Windows, Linux computers, and mobile devices such as the Nokia 770 Internet Tablet.
Version 2.0: Added All Calls Free plan