I have used HelpSmith for a number of projects that I distribute on my own website. It is without a doubt the easiest to use Help System I have found among the many I have researched and tried over the years.
I still have HelpSmith version 5.x and as far as I know it is still reliant on the Microsoft Help Workshop software. If it still reliant on such software, my suggestion would be to find a way to provide a different compiler for the product since with Microsoft's past history one never knows when this product may be pulled from distribution.
Absolutely recommend this product. For those that are selling\distributing projects you cannot find an easier to use system for developing Help Files and Information than that which is HelpSmith
I use HelpSmith for the very reason it was designed for; to create Help System for the projects that I distribute. In my view, a well defined Help File is still the best documentation format available for such work. They are easy to build with HelpSmith, compact and compartmentalized. And if a user would like to be able to print a hard-copy of the information, he or she can simply request a version for printing.