From Divcom Software:
HelpSmith is an innovative help authoring tool allowing you to create CHM HTML help files, Web help, PDF, and printable documentation using the same source. The reliable help authoring system provides a powerful Word-like Unicode word-processor for editing help topics with dynamic styles and live spell checker, advanced approach to working with graphical files, and many other useful tools. HelpSmith, the help authoring tool from Divcom Software, enables creating help files and documentation from scratch and also allows you to import help topics from HTML, Word RTF, TXT files that can be written in different Unicode charsets. With HelpSmith you can provide help files for your application in popular help formats such as context-sensitive CHM Help files, a standard help format for program's Help in Windows.
HelpSmith supports all the features of HTML Help, allowing you to create the tree-type Table of Contents, alphabetical keyword Index, customize HTML help's help windows. If you are an experienced tech writer, HelpSmith offers the Import ability, which lets you import your existing help projects written in HHP or directly from compiled .CHM HTML Help files. The "What-You-See-Is-What-You-Get" principle makes working with HelpSmith as easy as using a regular office application. And, in fact, you do not have to learn any technical details to create first-class CHM files and other documentation with the HelpSmith authoring tool.