The OS project is an open-source project with source code under the Common Public License (CPL). This project was created by Robert Fourer, Jun Ma, and Kipp Martin. The code has been written primarily by Jun Ma, Kipp Martin, Robert Fourer, and Huanyuan Sheng. Jun Ma and Kipp Martin are the COIN project leaders for OS. Below we describe different methods for obtaining the C++ source code or the binaries.