With Wikipedia you can update the main text content, but there is no direct access to the backend or even to the templates/css/etc. Unless you meant MediaWiki b

With Wikipedia you can update the main text content, but there is no direct access to the backend or even to the templates/css/etc. Unless you meant MediaWiki being open source? That's an interesting datapoint. Do you know how quickly MediaWiki changes are pushed out to wikipedia? (Also, the idea I had in mind is more suited for a single host, rather than some software that would be beneficial to host on many different sites)