Help Development Studio is a versatile help authoring tool that creates WinHelp, HTML Help, and Web Help files from a single source. It offers a full range of features and is available for a free trial download.

One popular tool for creating WinHelp (.HLP), HTML Help (.CHM), and Web Help (.HTML) files is Help Development Studio. This fully-featured, stand-alone tool makes it easy to create high-quality documentation for any software application - without any technical knowledge required.
The program is designed to simplify the process of creating help files by providing an integrated environment where all the necessary tools and editors are available in one place. From the text processor to the Contents and Index editors, every tool is designed to interact with each other seamlessly. This allows for the automation of various actions and means that you won't need to switch between different programs just to edit one help file.
Help Development Studio enables you to write help topics, create Table of Contents and Index, and use any WinHelp- or HTML Help-specific objects and features. Its easy-to-use interface and affordable price make it an attractive option for independent developers, software development companies, technical writers, and help authoring professionals.
If you're looking for a quality tool to create help files for your applications, be sure to check out Help Development Studio. You can download a free 30-day trial to see for yourself just how useful this program can be.
Version 1.92:
Fixed a problem associated with using Browse Groups.
Fixed a bug which caused incorrect compilation of WinHelp files.
Minor bugs fixed