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/

C to Pascal Converter
   A C/C++/BCB to Object Pascal (Delphi/Kylix) translator. [Open Source, GPL]
   http://c2pas.sourceforge.net/

Code coverage tool for Delphi
   Cyamon's Discover is a coverage test tool for Delphi to detect unexecuted code.
   http://www.cyamon.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/

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/

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/

HyperDelphi
   Online converter Delphi source code to readable HTML code.
   http://www.duketown.com/marcel/hyperdelphi.shtml

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/

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/

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