In continuing with the post 5 Free Resources for iPhone App Development, here are some more resources for iPhone Development.

1. iphone-exif

   An Exif Tag library editor that enables direct viewing and editing of EXIF Meta Data tags in Jpeg files on the iPhone. The most obvious use is to manage Geo location tags into the image. However, it is also possible to edit any of the Exif tags or add your own that are not in the spec. This is really useful for image uploads from the phone for sites like Picasa and Flickr.

2. json-framework

   This framework implements a strict JSON parser and generator in Objective-C. You get free XML parsing support from the official iPhone SDK, but not JSON support. This is a way to add it.

3. openssl framework

   It is specifically intended for use in building secure iPhone applications alongside SQLCipher (https://www.zetetic.net/software/sqlcipher).

4. iphone-smtp

   This code implements a quick class for sending one off messages via SMTP on the iPhone.

5. cocos2d

   framework for building 2D games, demos, and other graphical/interactive applications. It is based on the cocos2d design: it uses the same API, but instead of using python it uses objective-c.