Living Address: Living Doc
- Documentation tool that automatically documents existing ASP and SQL Server projects. Presents the documentation in a web interface. [Commercial, trial version]
- http://www.livingaddress.com/livingdoc.asp

RoboHELP
- Training and consulting for RoboHELP family of products. Offers support options, product specifications, and ordering information.
- http://www.adobe.com/products/robohelp/

Visustin
- Visualize source code of many programming languages with flow charts. Help in documenting and reviewing algorithms.
- http://www.aivosto.com/visustin.html

HelpCruiser
- Destined for creation documents in various formats such as HTML, CHM, PDF, RTF and XML. It's optimized for solving tasks, that appear during the process of creation help files, descriptions and manuals. [Commercial]
- http://www.helpcruiser.com

Doxygen
- A documentation system for C++, C, Java and IDL. It generates Latex, HTML, RTF, Postscript and Unix man page outputs from a set of documented source files. [Open Source, GPL]
- http://www.stack.nl/~dimitri/doxygen/

Universal Report
- A generic code analysis and documentation tool to easily analyse and generate a structured and formatted overview of a given set of program codes in Basic, C, C++, COBOL, Fortran, Java, Matlab, Pascal, Visual Basic, Borland C++ Builder, Delphi, Kylix, Vis
- http://www.omegacomputer.com/

Color+Code
- Stores and colorize code snippets and its error message, if any. To be used for showcasing code snippets in forums, newsgroups or any other media where code coloring is not possible.
- http://code.doria.se/

IDIOM Source Code Compiler
- Compiles reusable text databases and HTML documentation from C, C++, Perl etc. source codes.
- http://www.visualco.de/

Helptrix
- Help authoring system for creating professional help and manuals in several formats (includes HTML and PDF) from a single source. [Commercial]
- http://www.helptrix.com

Web C Plus Plus: Webcpp
- Converts source code into HTML files via fully customizable syntax highlighting engine and color schemes; supports over 20 languages, runs on Linux, Unix, Windows. [Open Source, GPL]
- http://webcpp.sourceforge.net/

PTLogica TwinText
- Automatically generates HTML documentation from source code comments. Works with C, C++, Visual Basic and languages with similar commenting syntax.
- http://www.ptlogica.com/TwinText/

KDOC
- Generates LaTeX, HTML, and man pages from comments in C++ and IDL files. [Open Source, GPL]
- http://www.ph.unimelb.edu.au/~ssk/kde/kdoc/

ROBODoc
- Generates documentation in a variety of formats from source code. Supports HTML, PDF, LaTeX, C++, and Perl, among many others. [Open Source, GPL]
- http://www.xs4all.nl/~rfsber/Robo/

DOC++
- Generates TeX and HTML documentation from comments in C, C++, IDL, and Java files. [Open Source, GPL]
- http://docpp.sourceforge.net/

Natural Docs
- A documentation program that generates HTML from documented C++, Java, and Perl. Focuses on a transparent syntax that keeps the comments in the source code readable. [Open source]
- http://www.naturaldocs.org/

CoolDOC
- A tool for automatic generation of the documentation upon source code of the projects.
- http://www.cooldocteam.com/

Doc-To-Help
- A help authoring tool and add-ons. By ComponentOne.
- http://www.componentone.com/helptools.aspx?helptoolscode=1