I've used Delphi 2 through 7 I think. Later versions are more bloated but also create more efficient executables. That was true of Turbo Pascal versions too, I think I started at 4. The thing I liked most about Delphi I think was that it handled all the messaging between Windows components, yet did it in a way in which you could modify what it had written if you wanted to. With Visual Basic and Visual C it seemed like you spent forever manually connecting things. There was a minimal Delphi 3 that sold for $99 with an educational discount, that did most of what I wanted. Add in the free Internet Component Suite and it was mostly missing some database stuff.
There is Lazarus in the Raspbian debs which is based on free pascal and tries to emulate Delphi. It has some rough edges but it mostly works. Now I prefer C though. If somebody would turn Lazarus into a C++ Builder for Linux they'd have something. Add plugin modules for different widget sets like GTK, FLTK, QT etc. Well, there's Code::Blocks http://www.codeblocks.org/
and QT Creator, haven't spent much time with them.
One reason contributing to why I gave up on Glade is that devhelp doesn't work on Pis and probably never will. I forget the reasons, but it makes looking up help on a widget more difficult.