The following questions list many good iPhone open source frameworks:
- What open source Cocoa/Cocoa Touch Frameworks are out there?
- Open source iPhone components? Reusable views, controllers, buttons, table cells, etc?
- Is there any open source OCR project for the iPhone out there?
- Is there a good charting library for iPhone?
- Open Source Cocoa/Cocoa-Touch POP3/SMTP library?
- Open source iPhone Coverflow like library
- Open Source VoIP/SIP Objective-C Code
