[gregbarbosa]

Open source iOS apps are extremely helpful to anyone learning iOS development. There are intricacies to learn, and not everywhere teaches it all. Looking at someone else's completed iOS source code you can learn and understand UI/UX design patterns, the MVC process of creating iOS apps, and so much more.

I recently took a course in college for iOS development, and because of open-source code I was able to ace the class and get picked-up for potential funding on the class project.

Yes you need to pay Apple the $99 to get it on your own device, and no you don't need to jailbreak (unless you want to circumvent the $99). Plus there are other ways to get the app on your device without paying or jailbreaking (creating your certificates, etc).