Xcode tools for presentation of development's tutorials During WWDC we can see Xcode screencast code presentations where they highlight portions of Xcode and type text faster.

I've research a number of popular tools used for typing screencasts like: PlayItAgainSam and PlayerPiano also I've read this question Tools for presentations with Xcode that recommend the defunct tool Omnidazzle

Does anyone know a tool for making presentations based on Xcode?
They don't use any special tools. 
At WWDC they press Control and scroll to zoom in. That behavior can be enabled under Accessibility in System Preferences. 
For the code they use Snippets feature of Xcode to expand prepared pieces of code.