VocabTest is not free anymore
VocabTest is an easy to use and great to look at application, that will help you expand the size and level of your English vocabulary and improve your spelling!
VocabTest aims especially at students studying for standardized tests (GRE, TOEFL, SAT), but can prove useful to anyone looking to expand his vocabulary and achieve a higher communication level.
VocabTest initially includes the 1000 most common SAT words, with examples, featuring also great aesthetics.
VocabTest is not free anymore.