This chapter is a high-level description of a suite of programs denoted by the acronym OCEAN (Obtaining Core Excitation spectra Ab initio and with NBSE), where NBSE denotes the underlying NIST Bethe–Salpeter equation program. The chapter discusses the main computational steps, physical approximations and scope of user input, and presents various examples of calculated results. Likely improvements and extensions, and how to access OCEAN and its documentation, are also discussed.