Qt - Powerful, flexible and easy to use, Qt will help you not only meet your tight deadline, but also reduce the maintainable code by an astonishing percentage.
Python - Python is a clear and powerful object-oriented programming language, comparable to Perl, Ruby, Scheme, or Java.
FLTK - Fast Light Toolkit - Fast Light Toolkit (FLTK)
Rust - A safe, concurrent, practical language
wxWidgets - wxWidgets: Cross-Platform GUI Library
Java - A concurrent, class-based, object-oriented, language specifically designed to have as few implementation dependencies as possible