To assist developers in building technologies that can work in our technical ecosystem, NSA has developed GreyBox, a tool used to test, integrate and demonstrate that software can work with NSA's architecture. GreyBox includes mock-ups of interfaces for several common services that are dependencies for multiple mission applications in our classified environments. Developers can use GreyBox in their own unclassified software development facility to assess how well their software can interoperate with our interface. GreyBox is now available through the NSA Acquisition Resource Center (ARC). If your company is already registered in the ARC, you can download GreyBox from the ARC today. If you are not already registered in the ARC, visit Getting Started.