Freeware and Full Pc Downloads

HydraIRC

HydraIRC is an open-source IRC client with an attractive and easy to use interface. It supports DCC Chat and File transfers, Connecting to multiple servers, Dockable Floating Tabbed Windows, Autohiding Windows, DLL Plugins, Channel Monitoring, Message Logs, Event Viewer, Themes, Color schemes, Buddy groups, Audible and Visual Notifications , Reg-Exp Highlighting, Favorites and much more.
Win 98/Me/NT/2000/XP
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Bersirc
IRC chat client

Bersirc is a feature rich and nicely designed IRC chat client for Windows. It comes with a long list of features like: Multiple Server support, finger client support, DCC File Transfers and Chat, Smart Paste, Object Pascal Scripting, Internet Time Support (Swatch Netbeats) , Channel List Support, Favorite Channels list, Ident Server, AutoJoin on Invite, AutoRejoin on Kick as well as fully configurable date formats

Bersirc also features a ICQ like notify list, advanced filtering and a highly configurable user interface and a built in IRC user guide.
Win 95/98/Me/2000/XP
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Pidgin
Multi-platform instant messaging

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, and Zephyr.

Pidgin can log in to multiple accounts on multiple IM networks simultaneously. This means that you can be chatting with friends on AIM, talking to a friend on Yahoo Messenger, and sitting in an IRC channel all at the same time.

Pidgin supports many features of the various networks, such as file transfer, away messages, and typing notification. It also goes beyond that and provides many unique features. A few popular features are Buddy Pounces, which give the ability to notify you, send a message, play a sound, or run a program when a specific buddy goes away, signs online, or returns from idle; and plugins, consisting of text replacement, a buddy ticker, extended message notification, iconify on away, spell checking, tabbed conversations, and more.

Pidgin can work with:AIM
Bonjour
Gadu-Gadu
Google Talk
Groupwise ICQ
IRC
MSN
QQ
SILC SIMPLE
Sametime
XMPP
Yahoo!
Zephy

Win 95/98/Me/NT/2000/XP/Vista
Linux
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GuildFTPD

GuildFTPD is an FTP server with special support for IRC. It features AutoBan for hammering, a Port Hopper that randomly changes your port, Auto Password hopper that randomly changes your password. and several Mirc Options like Runs your timer for you (updates port, password info on your time, starts it etc.).

Report Window in mirc for all ftp activity.
You can issue most FTP commands from IRC and auto-Ban users for not being in a Mirc channel (optional) as well as several other features.
Win 98/Me/NT/2000/XP
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Trillian Astra
Versatile multi-IM chat program


Trillian™ is a fully featured, stand-alone, skinnable chat client that supports AIM, ICQ, MSN, Yahoo Messenger, and IRC. It provides capabilities not possible with original network clients, while supporting standard features such as audio chat, file transfers, group chats, chat rooms, buddy icons, multiple simultaneous connections to the same network, server-side contact importing, typing notification, direct connection (AIM), proxy support, encrypted messaging (AIM/ICQ), SMS support, and privacy settings.

Without stealing your home page and with no other included software, pop-ups, or spyware, Trillian provides unique functionality such as contact message history, a powerful skinning language, tabbed messaging, global status changes (set all networks away at once), Instant Lookup (automatic Wikipedia integration), contact alerts, an advanced automation system to trigger events based on anything happening in the client, docking, hundreds of emoticons, emotisounds, shell extensions for file transfers, and systray notifications

Win 2000/XP/Vista/7
Mac and iPhone
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ICQ 6
Popular chat & messaging client

Prep all your senses to experience a whole new world of communication. With ICQ 6, you are the creator of your own experience. You can spin it, twist it, and show what you've got.

Could IM be any faster? Yes it can!
Now you have the option of sending and viewing instant messages directly from within your Contact List or from the message notification.

Tired of jumping from one conversation window to another?
Manage all of your conversations in a single message window.
With ICQ 6 you can switch back and forth from conversation to conversation simply by clicking on the tabs at the top of the window.

Too popular to address all incoming messages?
The message notification box allows you to quickly check all the messages that were received while you were busy.

Some people can't throw anything away.
ICQ automatically saves your conversation history, so you can sort and search for important messages.

Send your friends an SMS from your PC with ICQ. Your friends can SMS back from their mobile directly to your ICQ message window.

Want to write to your friends? Talk to them? Just stare at their face? You can do it all!
ICQ 6 lets you use each communication panel separately, or do it all in a single window.

Win 2000/XP/Vista
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beware ircd

IRC server for windows. It can be used with any existing IRC client and is easy to set up (runs "out of box"). It claims to be faster than any other windows irc server.

The code is designed and tested for an extreme number of network users and channels. The server is light weight and uses very little ram and cpu resources.

It offers many configuration options including custom server reply/error messages, server relaying (ofcoarse) as well as a variety of security features like nick banning, CTCP flood protection, anti-spoof ping and many more. beware ircd is fully compatibile with RFC1459 and supports all or nearly commands. The program runs entirely from the command line and is configured via config files. No interface.
Win 98/Me/NT/2000/XP/Vista
Linux
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Adium
IRC chat client for the mac

Adium is a free instant messaging application for Mac OS X, released under the GNU GPL and developed by the Adium team. With Adium, you can connect to any number of messaging accounts on any combination of supported messaging services and then chat with other people using those services.

Supported services
AOL Instant Messenger (Including ICQ and .Mac)
Jabber (Including Google Talk)
MSN Messenger
Yahoo! Messenger (Including Yahoo! Japan)
Bonjour (Compatible with iChat)
Gadu-Gadu
LiveJournal
Novell Groupwise
QQ
Lotus Sametime

Mac OS X