best open source iPhone libraries

Question

I'm just starting to learn iPhone/Object-C programming. Rather than only learn about them after the fact, I'd like to have a sense up front of the open source libraries and frameworks that others make frequent use of. I'm thinking third-party packages, as opposed to pieces of the iPhone developer libraries, which are presumably all documented by Apple.

What I've come across so far:

• three20
• ASIHTTPRequest
• ObjectiveResource

Please add and comment on what you use and recommend (or direct me toward an existing list).

Answer 1

If you are programming for games, two common libraries for implementing social networking are:

• OpenFeint
• Plus+

Answer 2

TouchJSON is a good library for deserializing JSON.

Answer 3

Cocos2D -- for 2D games

http://cocos2d.org/

Answer 4

Some of my favorites are:

• CHDataStructures - all the data structures you wish Cocoa had but doesn't
• Flying Meat DataBase - An easy-to-use SQLite wrapper
• CorePlot - A plotting library
• MBProgressHUD - a heads-up-view for showing activity/progress

And to toot my own horn...

• StackKit - Accessing the StackOverflow API from within an iPhone app
• CHCSVParser - A correct CSV parser

Answer 5

Facebook three20 QuickConnect Family Flot

Answer 6

Omni libraries include some iphone code learn from some of the best ...

http://www.omnigroup.com/company/developer/