Apple Developer's Site:If you were going to learn about the iPhone app development, then you need to visit this site first. In order to get more information about the application development, this website acts as a perfect arena. First you need to sign up for the developers program and you need to download the necessary tools from the website.
iPhoneDev SDK Forums:This site acts as best sources for the iPhone App developer and here they will learn various features about the application development. This community is robust in nature and you can get anything from the community and you can post your queries, it can be cleared by the programmers in the community.
iCodeBlog:iCodeBlog.com is a feature tutorial blog that allows you the developers to learn the app development process. It doesn’t matter whether you were an advance designer or a beginner, iCodeBlog.com can be suitable for anyone. iCodeBlog.com provides you a better place to learn the coding process.
AdWhirl:AdWhirl is an advertisement service that allows you to include the ad services in your application. Once you have added the ad service in the app, you can able to sign up for the various features of the website. You can use the entire feature by using the same code itself. AdWhirl increases your revenue and also they can show their ads in your application.
Cocos2D: Cocos2D is a website that allows the users to set up a high level graphics in the game. Rather than using the basic graphics, you can include the higher graphics in your application. Suppose, if you were going to develop a high end game, then Cocos2D will definitely help you to create a game. You can also include more interactions with the help of Cocos2Dwebsite,Cocos2D provides various toolkit for the developers.
The other websites are:
SIO2 Interactive: Provides game engine for the app developers and include high graphics tool for their applications.
Shiva 3D: Shiva 3D is an awesome website, that allows you to include several graphihcs tool kit in your application.
OpenFeint: OpenFeintprovides you toolkit to establish many features in the iPhone application.
Urban Airship:This is a powerful feature which allows you to include the in-apppurchases in the applications. It allows you to include several toolkits in the developing website.
AppViz: This allows you to download and use the reports in your application. Therefore various app development tutorials have been clearly discussed in the above paragraphs.