1)   HelpSmith 1.0
The HelpSmith's ultimate toolkit with its visual approach takes the process of writing HTML Help files for your software applications to a new quality level.

 2)   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!