iMendi is a simple site for reviewing key vocabulary words and phrases in eight languages. To use the site simply select a language and start flipping flashcard questions. You get two tries at the answering correctly on each card before iMendi gives you the correct answer.
If you want to focus on a specific set of vocabulary words, you can pick a specific lesson or word list from iMendi's menus that appear above every flashcard.
iMendi is available in Spanish, French, German, Italian, Portuguese, Arabic, Russian, and Czech.