Fcitx is a simple and fast GBK Chinese XIM server.  It stands for Free
Chinese Input Toy for X, an input method for Unix-like operating systems.
To be more precise, it is a collection of Simplified Chinese input methods
based on XIM (X Input Method), including WuBi, PinYin, and QuWei, and is
distributed under GPL.  It is the descendent of gWuBi.

WWW: http://www.fcitx.org/