VoIP

Open source portable SIP softphone based on PJSIP stack for Windows OS.

Make calls, send messages and much more - freely and securely. Viber works on Android, Windows, Mac, Linux and iPhone.

Mumble is an open source, low-latency, high quality voice chat software primarily intended for use while gaming.

Crystal-clear cross-platform voice communication. A gamers' favorite.

Crystal-clear voice communication. A gamers favorite.

Communicate with your team mates with lag-free performance and unparalleled reliability.

Skype is free and simple software that will enable you to make free calls anywhere in the world in minutes.

Skype allows users to communicate with peers by voice using a microphone, video by using a webcam, and instant messaging over the Internet.

The next generation of Skype is available in preview on desktop computers. We're committed to providing a Skype experience you love, enhancing the way you talk, text, and experience the world – all from the comfort of your desktop.

Say "hello" to friends and family with an instant message, voice or video call on Skype for free. There's so much you can do, right from the palm of your hand.

Ventrilo is the next evolutionary step of Voice over IP (VoIP) group communications software. Ventrilo is also the industry standard by which all others measure themselves as they attempt to imitate its features.