This site by Jun Da contains a lot of very interesting resources for anyone who wants dig deeper into frequency lists. One set of data I haven't found anywhere else is a frequency list of syllables... Read more.

lingua.mtsu.edu

This article describes the basics of way to teach tones that is different from the traditional way mainly in that the third tone is no longer described as a falling-rising tone (since that is rarel... Read more.

sinosplice.com

This is the best overview of spaced repetition research I have seen online or offline. It's thorough, well-argued and probably covers more than you were looking for. It's not specifically about Chi... Read more.

gwern.net

This site (originally a book) explains the difference between commonly mixed up (traditional) characters, published by Taiwan's Ministry of Education. As it says in the introduction, the main purpo... Read more.

language.moe.gov.tw

You don’t need to spend thousands on classes. You don’t need boring textbooks. You don’t need to be good at languages. And you don’t have to move to China or Taiwan (though that’s great if you can)... Read more.

l2mastery.com

Duanmu San's "The Phonology of Standard Chinese" is by far the best introduction to Mandarin phonology that I'm aware of. It's mostly useful for people who like phonology or are already at an advan... Read more.

hackingchinese.com

A blog written and managed by an advanced Chinese featuring reviews of books, TV dramas and games. Additionally, the blog also features recommendations for utilising media in Chinese language learn... Read more.

thecozystudy.com

This is a unique resource that shows how most common speech sounds are actually produced. Most other resources use animations and diagrams, but this is the frist I see which show actual MRI scans. ... Read more.

seeingspeech.ac.uk

Classical Chinese is something all learners will encounter, whether it's because it's part of a course you take, because you've started learning formal, written Chinese or simply because you want t... Read more.

hackingchinese.com

This is a digital version of the official authoritative stroke order standard used in China. It is sorted by stroke and is not searchable, so it's a bit hard to use. Thus, other resources will ofte... Read more.

yuke.blcu.edu.cn

This is a presentation by Thomas S. Mullaney about Chinese typewriters through history. In the digital age, typing in Chinese is easier than it has ever been, but how did the Chinese typewrite evol... Read more.

youtu.be

Character frequencies for Classical Chinese (i.e. not based on texts). This resource was discussed in this article: [The most common Chinese words, characters and components for language learner... Read more.

lingua.mtsu.edu

This is a free e-book with a collection of articles about how to learn Chinese, to which I have contributed one chapter about listening ability. This is a good collection overall with contributions... Read more.

livethelanguage.cn