OpenSatKit is a multi-facet platform for working with NASA’s open-source core Flight System (cFS). OSK supports developing cFS-based mission flight software (FSW), learning how to engineer cFS apps, controlling a remote cFS system on a Raspberry Pi, and developing prototype R&D cFS apps. OSK combines three powerful open-source platforms to achieve these goals: Ball Aerospace Corporation's COSMOS command and control platform for embedded systems, NASA's cFS ( NASA cFS Homepage), and Eric Stoneking's 42 Simulator.