Hey guys, I'm looking for tweaks which modify applications such as Mail or YouTube. For example, I have ProTube 2 (YouTube plugin that lets me do more things), Mail Enhancer Pro (adds more capabilities to the built-in mail app) and Safari Download Manager (lets me download on Safari, another stock app). What other good tweaks (that modify already-existing applications) are out there? Also, what are the best tweaks for Siri? I'm looking for tweaks that work on the iPhone 5 with iOS 6.1 JB.