This chapter describes the various development tools available in the marketplace for the development of projects using 32-bit microcontrollers. It also describes the basic operation of simulators, in-circuit debuggers, assemblers, and compilers. The advantages and disadvantages of simulators and in-circuit debuggers are given in this chapter. In addition, examples are given on how to use a simulator and an in-circuit debugger. The features of various development hardware, such as development boards, and development kits are described with reference to the manufacturers. Examples are given to show how some of these development boards can be used in real applications.