This site is best described as a Chinese version of Quora, so in other words a site where people ask and answer questions (and discuss other people's questions and answers). Read more.

zhihu.com

This game helps you learn tones. You will see the lyrics of Chinese songs approaching you and you're supposed to select which of them actually belong to the lyrics you're hearing. It's a reasonably... Read more.

fourtones.com

Tianya Club is a very popular online Chinese forum (according to Wikipedia, it's the twelfth most visited website in China). The site is massive, including not only a forum, but also blogs, photo s... Read more.

bbs.tianya.cn

Foreigncy provides daily digital flashcards, with audio, that prepare a user to read a foreign policy or economics from a regional source. The site also provide users with an English language summa... Read more.

foreigncy.org

CantoDict: an Online Collaborative Chinese (Cantonese) Dictionary. Read more.

cantonese.sheik.co.uk

This subreddit is, as the name implies, about reading books in Chinese. A book is chosen each week by the members and is then read and discussed. Usually, there are links to various versions of the... Read more.

reddit.com

Online Chinese flashcards that adapt to your learning, Chinese speaking practice using voice recognition, and a simple, fast Chinese-English dictionary. Read more.

fastchinese.org