Linphone

Encrypted voice for Android. RedPhone provides end-to-end encryption for your calls, securing your conversations so that nobody can listen in. It's easy to use, and functions just like the normal …

Silent Phone – Secure Encrypted Video & Voice Mobile Phone Calls You now have the ability to have secure encrypted phone calls between Silent Circle members, anywhere, anytime, with complete …

Blink, a state of the art, easy to use SIP client. You can use it with any SIP provider or its own fully-featured SIP service. Voice over IP * HD …

VPHO is a fully featured application that lets you make FREE phone calls, videocalls and videoconferences. You can also send free text messages, audio messages, photos, video messages and files …

Telephone is a VoIP program which allows you to make phone calls over the internet. It can be used to call regular phones via any appropriate SIP provider, including Google …

Combining voice calls, video calls and Instant Messaging in a simple interface, CounterPath's X-Lite helps you seamlessly transition from a traditional phone environment into the world of Voice over IP. …

Vidyo is Videoconferencing software and service for both desktop and mobile.

Twinkle is a soft phone for your voice over IP communcations using the SIP protocol. You can use it for direct IP phone to IP phone communication or in a …

pfingo (phone, freedom, Internet on the go), developed by Singapore's info-communications provider StarHub, delivers a suite of popular web-based services such as email (Google, Yahoo! or other email...

Home of the World's first free SIP/VoIP application for iPhone and iPod Touch 1 and 2. Siphon SIP/VoIP project is the first in his category that works on iPhone and …