1)   Halftone Search for Google Desktop 1.2.4
This free program extends the Google Desktop (GD) functionality by providing a native Windows interface and allowing GD to access more file formats. Allows you to customize the look and feel, manage plugins, extract compressed archives, and more...
Google Desktop, search, plugin, archives, chm, mht, hxs,

 2)   Document! X 5.0
Document! X automates the process of creating and maintaining documentation for a wide range of solution elements: VB.NET/C#/C++ .NET Projects; VB 5 or 6 / VBA Projects; Compiled COM Components and Controls; COM Type Libs, Databases, XSD Schemas.
documentation, .net, ndoc, help, f1 help, dynamic help, context sensitive help, chm, hxs, help 2,

 3)   HelpStudio 2.0
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.
help, help tool, help authoring, .net, innovasys, pdf, documentX, online help, chm, hxs,