veganism: Humanism, skepticism and freethought leap to mind. Ideologies tend to be secular. Fan clubs, exercise, diet, book clubs, social networks, school, music, art ... Just about everything that isn't religion.|||One of the first to leap to mind is nudist colonies. I am not sure what you mean by 'communities of like-minded people' - are you speaking of social clubs where people get together on a social level, or communities where people actually live together. If the latter, then there are several eco-devoted places where people decided to live in a co-op style of community and produce all their needs and some wants using the talents of those within the community. This is the theory behind the communes of hippies in the 1960's.