AppCake Source & Tutorial: How to get Free iPhone Apps
If you want to get free apps for the iPhone or iPod Touch, (for testing of course *wink*) you must first have your iPhone, iPad or iPod Touch jailbroken. After that, simply get on Cydia and add the Appcake repository.
Cydia -> Manage -> Sources -> Edit -> Add
Once you’ve added the source and it has updated, you want to stay under sources and go into your new iPhoneCake Source that was just added. Install AppCake HD.
Once installed, you can now go back to your springboard where you should find a new AppCake app. Go ahead and launch and explore. If you cannot find an app you are looking at, you may want to try the alternative vShare (formerly AppVV)