title: What are the most useful third party iPhone frameworks?
body: <p>What really super useful third party frameworks / toolkits / projects are out there that people have used and have found to be a huge help in building their iPhone apps?  Bonus points if you include a story about how it helped you on a real world project.</p>
  
  <p>I'll go first:</p>
  
  <ul>
  <li><a href="http://cocos2d.org/index.html" rel="nofollow noreferrer">cocos2d</a></li>
  <li><a href="http://code.google.com/p/json-framework/" rel="nofollow noreferrer">JSON.framework</a></li>
  <li><a href="http://github.com/AlanQuatermain/aqtoolkit" rel="nofollow noreferrer">AQToolkit</a></li>
  </ul>
  
  <p>EDIT: turned this community wiki</p>