I recently learned about Philologus from the RS Teacher blog. Philologus (weird name, great product) allows teachers and students to create free online games like Deal or No Deal and Who Wants To Be a Millionaire?.
You can create these games for review of information, and then they can be played online — the games are hosted by the site. They’re also good to reinforce how to formulate questions.
English Language Learners can create questions and answers that are on their language level, so it’s good to use for differentiated instruction.