There are many free applications that produce similar designs If you consider getting the payed option programs.
Any software can design gui easily, just with enough practice as they have variety of application such as the common choices gimp and paint net - inkscape ect. They provide similar techniques in both programs you could still achieve those quality game icons/ UI, you just have to learn the software and basics of it consider finding one that feels comfortable to you. Refer to previous threads that includes majority of information;