Source Help Builder - Create help system for Delphi source code. It can be generated as popular Help formats (HLP and CHM) so printed documentation in PDF format. - http://www.srchelp.com
Delphi Application Peeper - An tool which allows you to investigate Delphi and C++ Builder applications during them are running. [Freeware and commercial versions] - http://www.devrace.com/en/dap/
JADD - Just Another DelphiDoc - Automatic generation of documentation on Delphi projects from the source code (HTML, (old) Windows Help, LaTeX, PDF and export to XMI) and creating of diagrams. [Open source, GPL] - http://delphidoc.sourceforge.net/
AutoFlowchart - A tool to generate flowchart from source code C,C++,VC++(Visual C++ .NET),Delphi(Object Pascal). Its flowchart can expand and shrink. Also in VCL component version with FlowchartImage name. [Commercial] - http://www.ezprog.com/
Delphi + JavaDoc = DelphiCodeToDoc - DelphiCodeToDoc is a free documentation system for Delphi. It uses information about source code symbols and formatted comments in files to produce accurate documentation from application and component. - http://dephicodetodoc.sourceforge.net/
LizaJet Installer - Installer for Delphi developers based on Object Pascal Script, a design Studio and a common framework for installation and upgrade. - http://www.lizajet.com/
Code coverage tool for Delphi - Cyamon's Discover is a coverage test tool for Delphi to detect unexecuted code. - http://www.cyamon.com/
C to Pascal Converter - A C/C++/BCB to Object Pascal (Delphi/Kylix) translator. [Open Source, GPL] - http://c2pas.sourceforge.net/
HyperDelphi - Online converter Delphi source code to readable HTML code. - http://www.duketown.com/marcel/hyperdelphi.shtml
Doc-O-Matic - A tool for creating fully cross linked documentation systems and manuals in PDF, HTML, HTML Help, Windows Help and RTF. - http://www.doc-o-matic.com/