I\'m aware of the excellent DevExpress LayoutManager & the half-attempts included in new releases of Delphi.
But I wonder whether an Open Source layout manager does
I personally believe that the system of Aligns, Anchors, Constraints and the occasional OnResize event does a better job if you want to make a "beautiful" and flexible user interface in Cocoa as well as in Delphi. I have worked with Layout Managers in Java, created user interfaces in code and I'm not convinced that these things make life easier. They didn't for me anyway. Although the Devexpress stuff looks impressive...