What you need for this book
The only software you need is Unity 5.x, which can be downloaded from the official website:
http://unity3d.com/
However, it could be useful if you have some graphics programs for use throughout the recipes in this book for — rapid mock-ups and custom graphics.
Furthermore, Unity 5.x Pro is required to follow the last chapter of this book, since we will use render textures, which are available only with Unity Pro.