Despite much progress, developing a pervasive computing application remains a challenge because of a lack of conceptual frameworks and supporting tools. This challenge involves coping with heterogeneous entities, overcoming the intricacies of distributed systems technologies, working out an architecture for the application, encoding it in a program, writing specific code to test the application, and finally deploying it. We present DiaSuite, a tool suite covering the development life-cycle of a pervasive computing system. This tool suite comprises a domain-specific design language, a compiler for this language, which produces a Java programming framework, an editor to define simulation scenarios, and a 2D-renderer to simulate pervasive computing applications. We have validated our tool suite on a variety of comprehensive applications in areas including telecommunications, building automation, and health-care.