There are Free Apps in the Apple App store, and Cydia and other jailbreak repositories... those cracked/pirated apps you're wondering about??
[WARN]We are now taking a ZERO TOLERANCE to piracy discussion. Discussions regarding the pirating of video games and/or App Store apps for use on jailbroken iPhones will not and can not be tolerated. Any posts containing links and/or discussion of any pirated material will result in a immediate and permanent ban from iMore forums.
Thanks for understanding.[/WARN]