N-Maschine is the ultimate German learning app and Der Die Das trainer and as such it will help you learn the meaning of 1000 of the most frequently used German nouns, their gender, their plural form and the way the Der, Die, Das articles change depending on the prepositions that precede them:

Example: The Car --> das Auto --> die Autos --> mit dem Auto.

The app is also a game, that means you have to gain points to complete levels.
Learning german nouns and grammar can actually be a lot of fun after all!
Try it!