1)   HelpScribble 7.8.1
Full-featured, easy-to-use help authoring tool for creating WinHelp (.hlp), HTML Help (.chm), a printed manual and online documentation (on a web site) from the same source, from start to finish. Can import help files created with another tool.

 2)   Help Explorer Viewer for Linux 3.0
Help Explorer Viewer is a full-featured help viewer for both Windows and Linux. One of its main advantages is 100% support of the WinHelp (.hlp), MS HTML Help 1.x (.chm) and MS Help 2.0 (.HxS) help file formats that are widely used in Windows.

 3)   HelpStudio 3.5
Generate help output in cross-platform plain HTML, HTML Help, Help 2.0 or printable PDF. HelpStudio seamlessly combines a feature packed WYSIWYG authoring environment with HTML based layout templates.

 4)   Help Explorer Viewer for Windows 3.0
Help Explorer Viewer is a full-featured help viewer for both Windows and Linux. One of its main advantages is 100% support of the WinHelp (.hlp), MS HTML Help 1.x (.chm) and MS Help 2.0 (.HxS) help file formats that are widely used in Windows.

 5)   HelpCruiser 2.2
This program allows you to create and transform text documents into any format (HTML,CHM,PDF,XML etc.). HelpCruiser is optimized for solving tasks that appear during the process of creating help files, descriptions and manuals for software products.

 6)   HelpSmith 3.5.5.1
HelpSmith is a help authoring editor which lets you create CHM, Web Help, PDF, and Print Manuals without having to learn anything or code lots of HTML files. The product includes support for dynamic styles and many other useful features.

 7)   Help Explorer Server 1.0
Help Explorer Server is a web-based application designed for viewing compiled help files in different formats: Microsoft Windows Help (WinHelp) - .HLP, Microsoft HTML Help 1.x - .CHM, and Microsoft Help 2.0 - .HXS.

 8)   DC Help Authority 3.71
Help Authority is the only program that lets you create online help files from any point in your program. It helps you write multiple help topics, assign them to different areas, and link to them from anywhere, down to the smallest grid and column

 9)   Help Generator for Microsoft Excel 3.0
Help Generator for Microsoft Excel easily adds Help and documentation to your Excel spreadsheet applications. Generates topic pages for Worksheets, Charts and VBA Forms. Produces HTML Help, HTML Help web-based help and documentation in Word.