Chamonix is a CHM viewer for Mac OS X 10.3 Panther and beyond. It is an Objective-C app that uses CHM lib (http://sourceforge.net/projects/chmlib), Cocoa and WebKit. It supports ToC, Indexing, Search and Favourites and multiple CHM documents.
What's new in Chamonix
Fix HTML view resizing
Spanish Translation - thanks to 'The Evangelist'
Fixed a bug where Chamonix crashed on loading a page
Display escaped (&) ampersands correctly in the table of contents