What programming languages do you prefere for Ubuntu desktop applications?

Question

I want to make a small cross-platformic app and it must be open sourse (in beginning) and then NOT open-sourced. Your opinion, please :-)
P.S.: my app will test pupils by school local net

Answer 1

At first i thinked about php+mysql, but i haven't any partice with it. Maybe python, huh?

Answer 2

Cross-platfor--

java.

Answer 3

Use Qt5 to write C++ cross-platform software.