CHAPTER 14 Scala Tools, Libraries, and IDE Support In the previous chapter, Chapter 13, we looked at how to design scalable applications in Scala. In this chapter, we discuss tools and libraries that are essential for Scala ap- plication developers. We briefly introduced you to the Scala command-line tools in Chapter 1. Now we explore these tools in greater detail and learn about other tools that are essential for the Scala developer. We'll discuss language-aware plugins for editors and IDEs, testing tools, and various libraries and frameworks. We won't cover these topics in exhaustive detail, but we will tell you where to look for more information.