The ones I've found most effective are schools for autodidacts (40-50 around the world), most of them are part of the 42 school network (I'm at the one in Paris

The ones I've found most effective are schools for autodidacts (40-50 around the world), most of them are part of the 42 school network (I'm at the one in Paris), but there's also Holberton School and Epitech. Then, I'd say hackerspaces or playful/collaborative co-working spaces.