Handheld_XH facilitates automatic detection of mobile browsers (not tablet browsers), so you can present them a mobile friendly website by either redirecting them to another site or by simply switching to a special template. The plugin can also be used by other CMSimple_XH components, which want to adapt to mobile browsers.
It requires a UTF-8 encoded CMSimple_XH installation. It is released under GPLv3.
The plugin was originally developed by Brett Allen. He handed it over to me in summer of 2012.