Nettalk
Nettalk is a freeware IRC client for Windows. In contrast to many other IRC clients, as Nettalk's user interface is based on Windows standards, it allows inexperienced users to quickly learn it and become comfortable with IRC. There are many languages available for the user interface including not only English, but also German (obviously), Dutch, Russian and Hungarian.
One of the features of Nettalk includes the ability to hold the configuration of servers separately (or even multiple connections to the same server), and to maintain aspects of these automatically. These include Nick Serv-identifications and the channels which were in use when last disconnected. By automatically tracking these for you, when you next connect your identity and preferred channels are automatically restored.
Nettalk has many features including alerts when your nick is mentioned, the generation of HTML pages so that you can keep conversations for later, full logging, the support for DCC, multiple colours, watched friend lists, full screen private messaging, whispering and for advanced users a Visual Basic like scripting language.
For more information see wikipedia. Nettalk_(Windows_chat_software)
Original German content : Nettalk