Whether you are starting out or in the middle of your UX career, Ryu understands exactly what are the things people consider when deciding which prototyping tool to use. Prototype Resource Map Lite is your best bet if you need help with understanding the types of prototype softwares and services available. This guide can help you decide which one to learn or use by giving a very detailed review of each kind of service and comparing them. From price to compatibility, applications to usability, it will give you an overview of every tool available. For me, who was just starting out in the field of prototyping, it was a great help in deciding what to start with. I hope to learn much more from the other available resources.