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xchm - xCHM is a cross-platform GUI front-end to chmlib, with borrowed bits from Pabs' chmdeco project.
Google Drive - Docs - Create a new document and edit with others at the same time -- from your computer, phone or tablet. Get stuff done with or without an internet connection. Use Docs to edit Word files. Free from Google.
Microsoft HTML Help - Microsoft HTML Help is the standard help system for the Windows platform.
Adobe Acrobat DC - Make your job easier with Adobe Acrobat DC, the trusted PDF creator. Use Acrobat to convert, edit and sign PDF files at your desk or on the go.
Chmox - Chmox is a free (of charge), open source application for OS X which lets you read Windows Help...
Wondershare PDFelement - All-in-one PDF editor