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The General Mission Analysis Tool (GMAT) is the world's leading enterprise, multi-mission, open source software system for space mission design, optimization, and navigation. The system supports missions in flight regimes ranging from low Earth orbit to lunar, libration point, and deep space missions. NOTE: Non-release tagged commits are AS IS.
Oxidized Astrodynamics
Nyx is a high fidelity, fast, reliable and validated astrodynamics toolkit library written in Rust and available in Python
OREKIT is a free low level space dynamics library written in Java. Please visit our Gitlab instance for issues and contributions: https://gitlab.orekit.org
A practical astrodynamics for research and engineering applications
A Python platform to perform astrodynamics and space research.