About Google and Degoogling in schools

Here in Italy, often schools, the educative relationship betwenn teachers and students is kept through google classroom. Once I've worked in a school that had both solutions: Moodle (the usability is very very scarce) and Google classroom. During the years I've developped an increasing grudge toward Google, because in the very beginning I've had pinned a lot of hopes in this company, naively thinking that it could have changed the world for the better (don't be evil, a multibillion company who choose this as a motto! I was hopeful and impressed): I was very naive. Now I would like to know if there are systems (because Google classroom works very fine, I have to admit) that works equally fine or even better that are disappeared under the magnitude of this monopolistic leviathan.
Could someone help me?