CHM View Pro is available on the Mac App Store now, CHM View Pro is a professional chm tool, its can help you view your chm files, and export chm to PDF.

Features
● Search through the chm file. Automatically sorted by relevance.
● Find in the page
● Find by Index
● Tag powered bookmark
● Export whole file to PDF
● Back/Forward/Home
● Text zoom
● Automatically locate current document in table of content