Language
Englishpage.com
– vocabulary and interactive grammar activities. From Language Dynamics
ESL Partyland
– interactive quizzes, lessons and online forum for students
How to write an excellent paragraph in English
– Wendy Klatt explains how to improve a paragraph using a topic sentence, reasons with specific examples, and a concluding sentence. Includes video tutorials
Khan Academy
– a brief introduction to grammar
Skillwise English
– factsheets, worksheets and quizzes on topics: Reading, Writing, Spelling, Word grammar, Sentence grammar, Speaking and Listening. From BBC