UNIVERSITY OF WISCONSIN River Falls
You can learn and practice grammar and vocabulary through explanations, activities, and games.
http://learnenglish.britishcouncil.org/en/
A good website to practice and improve your knowledge of English grammar and vocabulary.
http://www.learnenglishfeelgood.com
http://www.englishdaily626.com/tfvocab.php?235
Tyrannosaurus Prep is a web game that quizzes your over SAT vocab and GRE vocab words.
http://marisaconstantinides.edublogs.org/2010/02/11/tech-tools-pedagogy-ii-word-clouds/#.V636FfkrLIV