KCHMViewer is a free, open-source chm (MS HTML help file format) viewer written in C++ for Unix, Mac and Windows systems. Unlike most existing CHM viewers for Unix, it uses Trolltech Qt widget library, and could optionally be compiled for better KDE integration. It does not require KDE, but may be compiled with full KDE support, including KDE widgets and KIO/KHTML.

http://repo.openpandora.org/?page=detail&app=kchmviewer