Is there a way to dress your python programs into a GUI without use of tkinter

Um hello everyone I’m a new user on git hub who has recently embarked on a new python project to create an educational tool for first graders but as I was writing a few days to finish I realized that no one would like to run the program in the terminal for places like schools so my first thought was tkinter but I had had experiences with tkinter before and felt its GUI’s were a bit retro and I wanted this program to have an urban look so I was wondering if I could get names of free open source applications used to dress up programs in a mordern GUI and how to use them ?