Englishtown is translated into 8 languages, has learning games, bulletin boards for grammar and culture questions, ESL/EFL teacher forums, a pen pal club, and a school for online classes.

English at Home offers learning, grammar, and vocabulary tips, idioms, and games along with a newsletter. 
Schmooze University has language games, an on-line dictionary, and much more.
TEFLGames has "interactive games, ESL activities and games for the classroom."