wxForms for Delphi is an integrated form designer plugin for CodeGear Delphi that helps you to create cross platform applications for Windows and Mac OSX using single source base.
wxForms code from Delphi can be compiled in Mac OSX without much change using FreePascal/Lazarus.
wxForms allows you to use all of Delphi's powerful Form Designer/ Editor features (Form Alignment, Object inspector, Component Palette etc ) to quickly create Cross platform applications. Components can be easily customized by modifying their properties in the object inspector.
wxForms for Delphi is the only wxWidgets Form designer that allows you to do form designing, code editing and debugging in one single place