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.
The plugin 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.
The plugin is in use on this website. Changes are listed in the changelog. For further details you can read the manual online.