1)   Visual WinHelp 3.0
Visual WinHelp is the quick and efficent way to create WinHelp .hlp documentation. The simple word processor interface makes accessing the features easy.

 2)   MGTEK Help Producer 2.2
MGTEK Help Producer is a help authoring tool that allows you to create Microsoft HTML Help 1.0 files, Microsoft Help 2.0 help files, and web based content from a Microsoft Word document.

 3)   Help Development Studio 1.92
Help Development Studio is a popular, full-featured, stand-alone help authoring tool, which is designed to create WinHelp, HTML Help, and Web Help files from the same source. Download your free trial copy now!