LYC - Learn Your Chords is a great companion for all musicians willing to learn their jazz chords and be able to improvise in every tonality.
LYC is based on the flashcards principle. You just tap the screen to show a chord and try to find the notes composing the chord as fast as you can. Playing this game regularly will help you memorizing quickly your chords.
LYC is also a chord database that permits you to look for a specific chord and visualize and hear the many proposed voicings.
Translated in both French and English.