AllSet Learning: It is a Shanghai-based learning consultancy dedicated to helping non-native speakers better learn Mandarin Chinese.
It has a clean interface and has lots of links for outside resources.
Learn Chinese Online Page: A website developed by California State University.Learn Chinese - Chinese Tools: On the right side of the main screen, there is a table of contents that has very useful lessons.COUSERA: Online university courses ranging from a broad spectrum of Chinese topics.Chinese Grammar Wiki: A reliable wiki page that offers easy-to-understand explanations for Chinese grammar.