IRC Clients

Windows: HydraIRC
Windows: Bersirc
Windows: Klient
Windows: .IRC : Windows .NET IRC Client
Windows: savIRC
Windows: Turbo IRC
Windows: Visual IRC 2
Windows: mIRC
Windows: Tucows IRC Section

Linux: EPIC4 (local download mirror)
Linux: BitchX
Linux: savIRC
Linux: KVIrc
Linux: X-Chat
Linux: xIrc
Linux: freshmeat's console IRC clients
Linux: freshmeat's X11 IRC clients

MAC: X-Chat Aqua
MAC: Snak
MAC: Ircle

WebChat: Bocazas java client for your website

IRC Scripts

Windows: NeMeSi Script v1.2 by #Helpme team (original site) 
Windows: WinBot the IRC Bot for Windows
Windows: IRC & protection for GRNet by tsoglanos29
Windows: ircN
Windows: www.mircx.com
Windows: www.xcalibre.com

Linux: lice
Linux: lice powered by HSOC

Trojan Removers

Windows: Cleaner3

Services for IRC Networks

http://www.ircservices.za.net/ (local download mirror)

Other Mirrors @ irc.gr

Linux Documentation Project
Samba