1)   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.

 2)   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.

 3)   VBdocman .NET 2.3
This VS .NET add-in generates documentation from VB source files. It parses Visual Basic .NET and ASP .NET projects and automatically creates the table of contents, index, topics, links, and context help in Help 2, CHM, HTML, RTF, XML and others.