Social Source Commons

VOIP service.

Free temporary phone number for use in public listings such as Craigslist.

Free conference call service.

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

a voip/IM client like Skype, but based on open protocols

otVoice converts your cell, home and work voicemail to text and sends it to your phone and email.

Mass phone-call and texting service.

Jajah is a software to make free audio and video calls to anyone connected to a PC to the Internet, to SIP-compliant devices and smartphones, as well as to interconnect to standard telephone and mobile users around the world.

Hosted application that lets users know when something happens in real time. Notifications can be made about classified listings, blog posts or social networks and can arrive via email, mobile phone, instant messenger or desktop/web application.

Free/cheap Internet telephony and handy IM tool.

SurveySolutions Pro allows users to create complex surveys, distribute them via the Web, email, or phone, automate survey response collection, and produce attractive presentations.

Operating system for Sony and most Nokia smartphones. Comes with a PIM, smartphone version of Office, and ability to sync with Outlook.

Hosted service to "text message enable" information and web pages.

The Ushahidi Engine is a platform that allows anyone to gather distributed data via SMS, email or web and visualize it on a map or timeline.

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

Wengo is a VoIP provider which allows you to make free PC to PC calls regardless of your partner's voip platform.