Index Cards is a Vocabulary Trainer for the iPhone. With Index Cards you can create your own word lists or simply use lists other people createt. With a program for your Computer this App gets pretty intresting because you are not bound to the small keyboard of the iPhone anymore.
This App goes along with the Swiss national card-game called "Jass". If you don't know what that is, I recommend you: go and learn it! Its a really good game that needs a little bit of brain. Wikipedia explains it pretty good: http://en.wikipedia.org/wiki/Jass. But what can you do with this App? this App simply lets you count the points for both teams with the traditional look of the "Jass"-blackboard. In addition it also supports the game "Coiffeur". Check it out, this game is much much fun. ;)