There are a couple of Chinese-native products like Wikipedia: Hudong and Baidu Baike, at least. They both have more articles than English Wikipedia, although I have no idea about their quality. And unlike Wikipedia they are for-profit companies. Anyone know of a good article that compares them in depth?
In the US we tend to look at the parallel Chinese Internet largely as a political question, censorship. But a primary reason China encourages homegrown products is simple economics. China isn't content to be a US economic colony, they build their own successful businesses.