PChat is an IRC Client packaged as a portable app, a fully gpl complient IRC Client for windows based entirely from X-Chat but compiled with MinGW but it's open-source so it works on linux too.

PChat is a fork of XChat made free from shareware issues the official XChat client has, so you can chat with your friends on PChat from an iPod, USB flash drive, portable hard drive, CD or any other portable media. It leaves no personal information behind on the machine you run it on, so you can take your irc client wherever you go.

PChat Portable Features:
1. DCC Transfers and chats
2. Plugin System to extend PChats features
3. CTCP
4. Choice of tabbed document interface or tree interface
5. Support for multiple servers either through normal connection or via SSL
6. Xtray tray icon (should be used instead of the GTK tray icon)

The license of this software is Free, you can free download and free use this irc client software.