The best apps in the appstore usually cost money, but some dudes have made a "work around". 

On your jail broken iPhone with Cydia installed, add the new source: http://cydia.hackulo.us and install the program: installous.

The program from Hackulo.us lets you get access/download/install some cracked apps that it basically gets from the net. A very easy and cool program, but a little slow as the interface is a web page inside the program.

Check out this video, self explaining:

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