Looking it up, there is WikiWikiWeb implements Federated Wiki, which Wikipedia describes its primary features as:

adds forking features found in source control systems and other software development tools to wikis. […]The software allows its users to fork wiki pages, maintaining their own copies. Federation supports what Cunningham has described as “a chorus of voices” where users share content but maintain their individual perspectives. This approach contrasts with the tendency of centralized wikis such as Wikipedia to function as consensus engines.

Gonna look more into this today, because this sounds super interesting to me c: