chat on IRC : IceChat

chat on IRC : X-Chat 2 for Windows

chat with different messenger clients : Trillian by Cerulean Studios

chat with different messenger clients : Jabber

chat with different messenger clients : Miranda IM

chat with different messenger clients : Qnext

chat with different messenger clients : SIM-IM

chat with the jabber network : Pandion

check multiple email accounts with 1 utility : ePrompter

phone free using the internet : Skype

phone free using the internet : Gizmo

phone free using the internet : KishKish SAM

phone free using the internet : switchboard

phone free using the internet : Voipbuster

talk to skype and google-talk clients : Festoon Unity

telnet/ssh to a site : PuTTY

use a better MSN Messenger client : Mercury Messenger

video conference with others : SightSpeed

Check out Open Source Software : Open Source Freeware : 400+ free applications and utilities.

Suggestions/corrections : eConsultant : Blog Archive : I want a Freeware Utility