Stack Exchange is a site where people can ask questions to the community and get answers back. These answers are then rated by other people in the community and the most helpful answer can be chose... Read more.

chinese.stackexchange.com

This site contains a huge number of lessons, complete with texts, vocabulary, audio, exercises and much more. And it's all free. Note that if you want to get the intermediate and advanced material,... Read more.

collections.uiowa.edu

Word Reference offers several good forums for discussing languages and this is the Chinese section. It's perhaps not as active as Chinese Forums and I don't follow this forum regularly, so I don't... Read more.

forum.wordreference.com

Langademy is a language learning social network that connects students with natives from all over the world. Students can practice Chinese, English, French or any other language at Langademy by mak... Read more.

langademy.com

Forumosa is a major online forum where you can discuss anything regarding Taiwan, including living there, learning Chinese, finding friends, jobs or language exchange partners and much more. There'... Read more.

forumosa.com

Mastering Chinese characters, whether you find them enchantingly beautiful or overwhelmingly complex, is essential for literacy in Chinese. Outlier Linguistics will help you understand how the Chin... Read more.

outlier-linguistics.com

看剧学汉语 is a community on Discord, gathering more than a thousand members, both native speakers and learners. While 看剧 (as in "watch TV series) is part of the name, the server also covers lots of oth... Read more.

discord.gg

Get Online Mandarin Chinese lessons from our Personal Language Tutors through Skype to increase your opportunities for career, travel and friendship or to follow your favourite Chinese film. Read more.

nativemonks.com

Floomli is a free platform for exchange languages during video call, voice call or text conversation. By joining Floomli you become a part of a global language practicing network . The main goal of... Read more.

floomli.com

Foreigncy has nearly 300 free Mandarin language training sets that help improve your media vocabulary, reading comprehension, and listening skills while raising your awareness of regional events. T... Read more.

foreigncy.us

From their website (if you have personal experience of their courses, please leave a comment): New Concept Mandarin specializes in teaching Mandarin Chinese (Putonghua) as a second language. Act... Read more.

newconceptmandarin.com