There are plenty of source code snippets and samples on free blogs and other resources online. Very few of them provide you with source code that constitutes of code that covers entire apps. However, there are some amazing source code bundles that cover entire apps that are published on the App store. These are great if you want to get under the hood and see exactly how these apps are made from start-to-finish. Here they are…

1. ABC 123 – Sequence memorization game, that utilizes Cocos2D. [ itunes link | source code ]

2. Colloquy – A conversion of the most popular Mac IRC client to iPhone. [ itunes link | source code ]

3. Diceshaker – Dice rolling simulator designed for role-playing-game lovers. [ itunes link | source code ]

4. Doom Classic – The classic 3D first person shooter game now open sourced on the iPhone! [ itunes link | source code | build instructions ]

5. Freshbooks – An iPhone App that allows of Freshbooks web invoicing software from your iPhone. [ itunes link | source code ]

6. Gorillas – Classic Worms/iShoot turn based shooter type game converted to iPhone from basic. Utilizes Cocos2D. [ itunes link | source code ]

7. Last.fm – Software that enables usage of the Last.fm platform for personal radio stations. [ itunes link | source code ]

8. Mobilesynth – A monophonic synthesizer designed for live performance. [ itunes link | source code ]

9. Molecules – Allows you to view 3D models of molecules and manipulate them through touch. [ itunes link | source code ]

10. Mover – Allows you to transfer stuff from one iPhone to another by “flicking” it to the other device. [ itunes link | source code ]

11. Natsulion – A basic twitter client converted from mac. [ itunes link | source code ]

12. NowPlaying – Allows you to check local theater listings, and check rotten tomato ratings. [ itunes link | source code ]

13. Packlog – Backpack journal client. [ itunes link | source code ]

14. PocketFlix – Find movies, and manage your Netflix information. [ itunes link | source code ]

15. reMail – E-mail client featuring ultra-fast search. Removed from app store, but source made available. [ source code ]

16. RobotFindsKitten – Port of a very silly “classic” ASCII game. [ itunes link | source code ]

17. Sci-15 HPCalc – Calculator app based on classic scientific HP-Calculator. [ itunes link | source code ]

18. Task Coach – Personal to-do list and task manager. [ itunes link | source code ]

19. Tubestatus – London train schedule tracker. [ itunes link | source code ]

20. Tweejump – Platform jumping game inspired by Icy Tower. Utilizes Cocos2D. [ itunes link | source code ]

21. Tweetero – Basic twitter client with image uploading. [ itunes link | source code ]

22. Twitterfon – Super-fast intuitive twitter client. [ itunes link | source code ]

23. Wikihow – A reader app for the popular how to wiki site. [ itunes link ] (available by e-mail from support@wikihow.com)

24. WordPress – Client for managing WordPress blogs. [ itunes link | source code ]

25. YourRights – Pocket database containing a summary of your legal rights. [ itunes link | source code ]

Thanks to ManiacDev.com for this list.