I have been working on a Kahoot alternative, Please find it on https://github.com/surajcm/darkhold . At work, we use Kahoot a lot to have fun tech quizzes and it really inspired me to create an opensource alternative with spring boot.It is not a complete clone (I don't want to be in trouble with copyright issues), I used some of the interesting functionalities to create a qurantine remote quiz tool. Any feedbacks are welcome :)