In order to benefit from this book, you will need a Minecraft account. The Minecraft game client can be downloaded for free, but an account must be bought at https://minecraft.net/. The other software that is used in this book includes the Spigot server.jar (this is different from the normal Minecraft server.jar) and an IDE, such as NetBeans or Eclipse. This book will walk you through the process of downloading and installing both the server and the IDE on a Windows PC.