Orekit aims at providing accurate and efficient low level components for the development of flight dynamics applications. It is designed to be easily used in very different contexts, from quick studies up to critical operations. As a library, Orekit provides basic elements (orbits, dates, attitude, frames, ...) and various algorithms to handle them (conversions, propagations, pointing, ...).
Everything you need to design, simulate and fly better rockets OpenRocket is a free, fully featured model rocket simulator that allows you to design and simulate your rockets before you build and flying them.
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