Social Source Commons

VOIP service.

Voip and instant messaging software.

Cause Caller is an interactive VoIP application that helps activists organize virtual phone banks. Cause Caller uses a Semantic Media Wiki to power its database of public officials contact information

CommuniGate Pro powers total Internet Communications based upon open standards like SIP for voice and data communications.

Druid is an open source unified communications platform, built around technology such as Asterisk, IMAP, XMPP. Druid gives your organization access to the best available IP communications platform that bringing together voicemail, VOIP, mobile phone, faxes and instant messaging.

An opensource Voice over IP phone allowing you to do free calls over the Internet.

Video email service.

A J2ME (java applet for mobile phone) application that lets you initiate cheap phone calls using a Finarea VOIP account.

The FreeSWITCH project is building an open source softswitch, which will be optimized for high definition voice.

fring is a free mobile VoIP software that lets you talk and live chat (IM) using your handset's Internet connection

Make free, short (up to 10 minutes per day) phone calls from your web browser.

Google VOIP service.

VOIP consulting services and products.

Audio/video Internet phone and instant messenger. It supports many popular instant messaging and telephony protocols such as SIP, Jabber/XMPP (and hence GoogleTalk), AIM, ICQ, MSN, Yahoo! Messenger, IRC, and Bonjour.

Ostel is a tool for having end-to-end encrypted phone calls. Our goal is to promote the use of free, open protocols, standards and software, to power end-to-end secure voice communications on mobile devices, as well as with desktop computers.

Raketu is an instant messenger that allows you to make calls from PC to PC and dialing out to landlines and mobile phones

Free conference call service with nice web-based management UI. Based on Asterisk VOIP server

SkypeSync imports the contacts from your mobile phone to Skype.

SIP-based VOIP software.

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 network using a SIP proxy to route your calls. It support encrypted voice communication using ZRTP/SRTP

The Voxwire Meeting Room is an unlimited computer-to-computer web conferencing application that allows people to talk to each other, send text-messages, and see the same website or other presentation on their screens

Free web conferencing tool that can make and record conference calls and online presentations.

WengoPhone is a free software Voice over Internet Protocol (VoIP) service. It allows users to speak at no cost from one computer to another. It also allows users to call landlines, cellphones, send SMS, make video calls and chat using various Instant Messaging services. WengoPhone is a FOSS alternative to proprietary systems such as Skype.