What is Konversation?
Standard IRC features. SSL server support. Bookmarking support. Easy to use graphical user interface. Multiple servers and channels in one single window. DCC file transfer. Multiple identities for different servers. Text decorations and colors. OnScreen Display for notifications. Automatic UTF-8 detection. Per channel encoding support. Theme support for nick icons. Highly configurable.
Windows version available at https://binary-factory.kde.org/job/Konversation_Release_win64/.