IntentBuilder is a type safe way of creating intents and populating them with extras. Intents were created to be very dynamic but often times the dynamic nature of intents is not needed and just gets in the way of writing safe code.
ActivityBuilder is a annotation base library using builder pattern to make inner activity communication more easier.
Through ActivityBuilder you can use one line of code to deliver parameters, start Activity and use lambda expression to replace overriding onActivityResult.