Most jailbreak apps are generally free to try, but you need to shell out a few dollars which  probably, you don't want to. But we have got a one line method fast and simple just for the sake of this.

Install Cydia apps For Free [How To] :

Go to Cydia >> Manage >> Sources >> Edit >> Add >>

It will add sinful repository to Cydia. Now, the search results of Cydia will show you apps  with the sinful logo. These versions of apps are cracked & free.