Delphi is a complete IDE. The language is called Object Pascal but can be informally referred to as Delphi language.

The language itself is far from being ancient and it supports very practical and modern set of features.

The IDE is expensive but there is a Lazarus (basically open source version of Delphi). It is somewhat less polished but is still very nice.

If you search for this exact phrase "cross platform GUI frameworks" there are more then enough links mentioning Delphi/Lazarus. They're of course only usable within their respective environments. Not universal like QT.