18F is an office inside the General Services Administration that helps other federal agencies build, buy, and share efficient and easy-to-use digital services. It is a team of technology experts that work with agencies to diagnose problems and then work alongside agency teams to find the right solutions. Headquartered at 18 and F streets in Washington, D.C., it is an office of federal employees acting as a civic consultancy for the government. The 18F Open Source Policy is described here and can be accessed here.