All you need to get the most out of this book is your brain, your computer with a modern web browser, and a free Salesforce developer org. You can sign up for a free developer org at https://developer.salesforce.com/signup. Of course other tools can help, but they aren't required. Optional tools include Sublime Text 3 (with the MavensMate plugin), Atom (with the MavensMate plugin), and Intellij (with the Illuminated Cloud plugin). Again, these are all completely optional. In later chapters, we'll discuss some JavaScript-related tools but we'll discuss installing them when we get there.