Spell Up. Speak to play and build up your English.
This is a great new game from Google which helps students develop their vocabulary through spelling and pronunciation. Using Chrome, students can actually speak to the computer and listen to the pronunciation of the words as they build a word tower. They can even listen to a speaking dictionary telling them what the words mean. This should get your students working autonomously to develop their own vocabulary and if they sign in they can track and share their results.
See on spellup.withgoogle.com