Wireless sensor network research is growing rapidly, but building and deploying real-world wireless sensor network applications still requires the assistance of technology experts. We present a user friendly toolkit that simplifies the process of building robust and extensible wireless sensor networks, with our first target application being long-term environmental sensor networks. This project includes a programing language called the Sensor Web Language (SWL), an Eclipse-based graphical user interface for writing SWL programs, and a compiler for generating a complete stack of deployable sensor network code. Currently we target Mica2 andMica2dotmotes,MDA300 sensor boards, Linuxbased servers for base stations, Java clients, and gateways using embedded Linux and cellular network modems.