Chinese (Mandarin)

Resources I've used to learn Mandarin Chinese:

Memrise (Ben Whately's HSK courses)

Teach Yourself Chinese

Podcast: Popup Chinese

Podcast: Chinese Class 101

Chinese Grammar Wiki

Bliu Bliu

Listeningpractice.org

Chinese Skill

Assimil Chinois (phrasebook)

italki (conversation exchange, writing correction)

Zhongwen browser plugin for Google Chrome

I've came across a couple other websites for pronunciation help. I also have a simple Chinese reader.