delphi TCollection TCollectionItem TCollectionEnumerator Delphi Class Explorer Window

 https://docwiki.embarcadero.com/Libraries/Alexandria/en/System.Classes

https://docwiki.embarcadero.com/RADStudio/Alexandria/en/Delphi_Class_Explorer_Window

https://blog.dummzeuch.de/delphi-ide-explorer-expert/

Delphi WinSight WinSight (Ws32.exe) A Windows "message spy" 

ModelMaker Code Explorer 

http://www.felix-colibri.com/papers/firemonkey/firemonkey_style_explorer/firemonkey_style_explorer.html

delphi class explorer   gives configurable hierarchical view of class libraries

Delphi Class Explorer.  To show the tree of classes, interfaces, and types hierarchy:  class  hierarchical  class libraries tree map

https://docwiki.embarcadero.com/RADStudio/Alexandria/en/Viewing_Hierarchy_of_Classes,_Interfaces,_and_Types_in_the_Class_Explorer