Skype may be the best known VOIP application on the web, but we have uncovered nine amazing alternatives that you should take a look at.

Oovoo

ooVoo is the next evolution in online communication — a remarkably easy way to have a face-to-face video chat with friends, family or colleagues, no matter where they are in the world.

Gizmo5

One of the bigger alternatives to skype which features: free PC-to-PC phone calls, interoperability with other SIP softwares such as the Google Talk or Jabbin. Gizmo also provides a facility to allow users to receive calls on a traditional phone number from mobile phones and landlines.

iVisit

iVisit for Mobile and Desktop enables push-to-talk across carriers, text messaging, and face-to-face communication with your family, friends, and colleagues. Transmit live video, share hi-res photos, and communicate with any iVisit user from your mobile device or desktop.

Jajah

Jajah claims to be less CPU intensive than skype. But whether it is or not, it is still great software.

Vbuzzer

Vbuzzer supports internet fax, instant messaging, RSS, video conferencing, interconnected with Windows Live Messenger, Yahoo Messenger, AIM, and ICQ. VoIP features include free Internet calls, low cost PC to phone, and phone to PC calls.

Mabber

Mabber is simple but very effective functionalities. For those of you that prefer software without the gimmicks.

Ekiga

Ekiga (formely known as GnomeMeeting) is an open source VoIP and video conferencing application for GNOME. Ekiga uses both the H.323 and SIP protocols. It supports many audio and video codecs, and is interoperable with other SIP compliant software and also with Microsoft NetMeeting.

Google Talk

Google’s approach to instant communications. An application for Windows that offers VoIP and instant messaging. Mac users can talk with Google Talk users using Jabber-enabled clients such as Adium and iChat. Linux users can use Gaim.

MizuPhone

MizuPhone tries to combine the SIP compatibility with P2P inteligence and an intuitive GUI. It is a perfect choice for everybody who wants to keep its telephone bills to minimum while using the greatest features from the VOIP industry.