I came to Unix at that time with Delphi fresh in my mind (Delphi 1/2 IIRC ) and the only thing that showed anywhere near similar promise was Qt, though it took a long time for it to get similar features in both the object model (properties etc) and the UI builder.
One of the many things I loved about Delphi compared to other RAD tools of the time was that it was the only one that supported and encouraged modular separation of logic and UI. In most others (VB!), the IDE did nothing to help you, and most people ended up with all their logic mixed into the UI code, simply because the UI code was the focus of the whole IDE.
I learned to program using Borland Turbo C for DOS, but my first GUI applications were built with Delphi 2.0, which was the first 32-bit version. I earned my first money ever selling a shareware application I built with Delphi, before reaching puberty yet!
The Windows platform was awful so I ran away to Unix, and trying to find something even close to Delphi was just impossible. The best thing we had was Tcl/Tk, which I used a fair bit.
I tried Java at the time and remember saying to myself: You got to be kidding me.
Eventually I gave up on GUI development for Unix and embraced the web browser is the UI philosophy and develop the back-end in Python (then a fairly new language). Best career move I ever made.
The only options available were a few 4GLs that cost more than even Delphi licenses are worth nowadays.