One-Stop recource for English with grammars, exercises and tests.
Lots of useful tips for writing, grammars, etc.
Grammar with nummerous Audio examples for Spanish speakers.
Grammar with nummerous Audio examples for Italian speakers.
Grammar with nummerous Audio examples for German speakers.
Video news with text from CCTV in China. Various topics with slow reading speed. Very good for English comprehension.
Online dictionary with audio with lots of extra features, such as examples, sentenses, frequency of usage etc.
It's my favorite site. It's also recommended by our academic assistants at my university. It's useful not only in everyday life but also while reading scientific sources.
This site has high quality dictionary with various pronunciation, thesaurus, quotes, flashcards encyclopedia and translator. Used by many native speakers.
This site has grammar, vocabulary, business English, idiom, phrasal verbs, proverbs, ESL exercises, etc.