Miranda IM is a multi-protocol instant messaging client for Windows. Very light on system resources and extremely fast, Miranda IM requires no installation and can be made to fit on a single floppy disk or USB drive. Featuring a powerful plugin-based framework and boasting over 350 plugins, Miranda IM is one of the most flexible and customisable messaging clients on the planet.

Protocol Support:
* AIM (AOL Instant Messenger)
* Gadu-Gadu
* IAX (Inter-Asterisk Exchange)
* ICQ
* IRC (Internet Relay Chat)
* Jabber
* MSN
* Netsend
* Tlen
* Yahoo
* And more…

Developer: Miranda
License: Freeware
OS: Windows All
Size: 2.4 MB
Download Miranda Miranda IM 0.7.6 Preview Release #1 link

Gizmo is a Free Phone For Your Computer. That makes calling as easy as instant messenging.

Call Gizmo Members for Free
* Any call to a Gizmo user is free. No matter when, no matter where, no matter how long. Free. There’s no monthly service charge. Nor is there a set up cost. Gizmo is free.

Save Big on Calling to Phones
* Save up to 98% on calling to mobile and landline phones anywhere in the world. Rates start at 1.9 cents a minute and your account can be used to save money when calling from your computer or mobile phone.

Instant Messaging(IM)
* Chat with AIM and MSN buddies directly from Gizmo. You can now add your AOL Instant Messenger and MSN Messenger buddies to Gizmo with a few easy steps.

Two-way Text Messaging (Beta)
* Send SMS messages directly from your Gizmo account. Your friends can reply directly to your messages and you’ll receive their reply right in Gizmo.

and much more…

Developer: SIPphone
License: Freeware
OS: Windows All
Size: 13.5 MB
Download Gizmo Project for Windows 4.0.2.361 link