EST Help Author Pro creates the most popular help formats from a single source

It supports the following output formats:

Ansi Text Manual, Unicode Text Manual, RTF Manual, HTML Manual, HTML Web Help, HTML Web Help with frames, HTML Web Help with JAVA support, Windows Help, CHM Help, Electronic Book (EXE)

Most important features of this software:

Professional Text Editor
Keyword and Index editor
Built-in live spell checker and thesaurus
Advanced font and paragraph formatting
Supports bullets and numbering
Table support
Built-in syntax high lighter for developers
Topic information export to so many different formats
Powerful Screen capture Tool
And so many other features...