Messengers

Skype is a software that lets you make free PC to PC calls to anyone else on Skype, anywhere in the world. And even though the calls are free, they are really excellent quality. If you and your friends, family or business contacts are using webcams, you can also make free video calls. You can even call landlines and mobile phones at really cheap per minute rates (and there's no setup or subscription fee). Skype is available for Windows, Mac and Linux (video calls are currently available only to Windows and Mac users). Free download.

AIM Pro is the advanced version of AIM. With this IM you can experience high level quality and robust communication. It includes the familiar features of the AIM service, and adds powerful new features for busy professionals.

Google Talk enables you to call or send instant messages to your friends for free, anytime, anywhere in the world. Google Talk allows you to get in touch with an IM, email, or a call (only between Google Talk users) and supports files transfering. Google Talk requires Windows XP/2000 but Mac and Linux users can connect to Google Talk using other IM clients. Free download.

ICQ ("I Seek You") is a program you can download that will let you know when friends and contacts are also online on the Internet. The most updated ICQ version (5.1) features instant messaging, SMS, voice and video chat, as well as games, customizing tools and other ICQ extras. Windows only. Free download.

Project teams can make decisions faster by collaborating using Zoho Chat. Email communication is offline whereas chat communication is online and help in making decision faster. Supports Yahoo, AIM, MSN, ICQ, Google, and Jabber

Inbuilt in Win XP messenger, that enables to share files, documents, and pictures, communicate with voice and video, share an application or whiteboard, get help with Remote Assistance, set up alerts

An internet telephone. As simple as an instant messenger. You can make free calls to all Gizmo users and features free voicemail and conferences calls from your desktop. Gizmo also provides inexpensive add-ons that let you make and receive phone calls from any mobile and landline phone. At the moment you can make free calls to 60 countries. It works on Windows, Mac and Linux. Free download.

Miranda IM is a multi protocol instant messenger client for Windows. Miranda IM uses very little memory and is extremely fast. Only the most basic features are built in, but there are currently more than 350 free plugins available for download that allows users to extend the functionality of Miranda IM. Additionally, this IM doesn’t require installation.

Pidgin is an instant messaging program for Windows, Linux, BSD, and other Unixes. You can talk to your friends using AIM, ICQ, Jabber/XMPP, MSN Messenger, Yahoo!, Bonjour, Gadu-Gadu, IRC, Novell GroupWise Messenger, QQ, Lotus Sametime, SILC, SIMPLE, MySpaceIM, and Zephyr.

Office Communicator 2007 is a unified communications client that helps people be more productive by enabling them to communicate easily with others in different locations or time zones using a range of different communication options, including instant messaging (IM), voice, and video. Integration with programs across the 2007 Microsoft Office system gives information workers many different ways to communicate with each other via a consistent and simple user experience.