WhatIf is kotlin extensions for expressing a single if-else statement, nullable and boolean.
Qustom helps you make quick custom dialogs for Android. All this is, for the time being, is a way to make it easy to achieve the Holo look in a simple dialog that has a different divider color and text color.
Colors is a theming library for Android. It allows your app to use over 4,000 color combinations from the Material Design Palette by separately picking a primary and accent color.