A couple of years ago I was contacted by a teacher just down the road from me in Portland, Maine who had developed an online geography game with the help of one of his students. That game was called GameOn World and it is still going strong today. In fact, they continued to work on it and it is was recently one of the sites that I include in my best of the web presentation.
GameOn World is played in a manner similar to Kahoot. The teacher projects the game questions on a screen and students reply from their phones, tablets, or laptops. One of the convenient features of GameOn World is that you don't have to create an account in order to start playing fun geography and history games with your students. In GameOn World the teacher selects a game category (cities, places, and timeline are a few of the categories) and starts the game. The students join the game by going to GameOn.World and entering a game pin. In the location and timeline games, students answer the questions by moving a placemark on a map or selecting a date on a timeline. In some of the other games students answer by choosing a number on a sliding scale.