ArCHMock is a viewer for CHM (Microsoft Compiled HTML Help) files with the following features,

• Search using built-in index with pattern highlight,
• Printing support (currently loaded section only)
• Bookmarks,
• Saving last section position for documents,
• Narrowing search results for patterns containing multiple tokens,
• Window title displays current section,
• Document encoding detection,
• Print button can be put on the toolbar

License: MIT License

Known to be compatible (but not tested) with Mac OS X on (RISC-based) G3 and G4processors