ESL EFL resources for teachers and students (worksheets printables lesson plans exercises quizzes): Improve your English by listening to English radio programs on the Internet

British Council Resources

Take the IELTS test in your country (Africa, Asia, Europe, Middle East, Oceania, The Americas)
IELTS - International English Language test (British Council English exam centres in over 100 countries offer IELTS tests up to 4 times a month)
For Chinese students and teachers

Teaching English (the global home for English teaching on the web brings together everything busy teachers need, from classroom materials to ideas for development, with Activities, Lesson plans, Tips, Teaching kids, BritLit, Links, and Quizzes

Learn English central (Practise through themes; Test your level; Read, write and listen; Learn grammar & vocabulary; Have fun with English), with sections for professionals (specialist English language practice such as mini courses on Journalism, Finance and Legal English; practice and advice with IELTS and Cambridge ESOL exams in the lesson downloads and exams section; work skills and study skills) and kids (games, activities, songs, writing)

Sites For Teachers (Lesson Plans, Worksheets, Activities, Clip Art in subjects like Reading, Mathematics, Science, Social Studies and Writing)
WritingFix (a global resource for Writing teachers with hundreds of free interactive lessons and quality resources for classrooms where writing is taught, not just assigned; with interactive writing prompts and lessons for teachers, students and writers)

Ultimate Top 100 Kids Sites (for children, teens, parents, and teachers, with links to fun, games, education, coloring, poetry, stories, cartoons, worksheet creator or generator, game makers, printables wizard and on-line teaching materials makers with images)

ESL Kids Lab for English teaching and learning.
MES-English.com by Mark Cox (free printables for teachers of young learners)
ESL Tower (printable grammar and vocabulary exercises to make the lives of English teachers very easy)
ESL Printables, a website where English language teachers exchange resources like worksheets, lesson plans, activities, etc.
ESL Galaxy offers over 2,368 free printable worksheets for ESL lesson plans and ESL Activities and there are more additions every other day