I only put links on the Favorite Sites  section on my English Themes For Beginners page that I think are very superior English language development activities.  I’ve just placed a new site in that section.

Wordbuilder is an excellent spelling, vocabulary, and phonics site from Houghton Mifflin.  Students are told a word, in the context of a sentence, and then have to spell it.  It’s designed as a game, and there are literally hundreds, if not thousands, of opportunities to play.  It’s appropriate for beginners through Intermediate English Language Learners.  Audio and text support is provided.