Probably the biggest collection of free iOS tutorials on the Internet. Ray and his team have written tutorials for all aspects of iOS app and game development and are adding more all the time. They have also published several books that you can buy from the store.
Instabug helps you collect feedback and bug reports from your users and testers by simply shaking their phones. Comprehensive reports are forwarded to Instabug’s dashboard including complete app data, device details, and most importantly, the reproduction steps. Integrate the SDK in less than a minute and get started for free.