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Do you want to go Mars but don't know when to leave or how much to bring? Do you want to study Earth protection by planning a mission to a near-Earth asteroid? Do you want to place a telescope in an orbit that is always looking outwards from the Earth and Sun? The General Mission Analysis Tool (GMAT) is an open-source space mission design tool to help you answer these and many other space flight challenges. GMAT is developed by a team of NASA, private industry, and public and private contributors. It is used for real-world engineering studies, as a tool for education and public engagement, and (after completion of final acceptance testing in Sept. 2013) to fly operational spacecraft. Web Site: http://gmatcentral.org/298 weekly downloads
The Java Astrodynamics Toolkit is a library of components to help users create their own application programs to solve problems in astrodynamics, mission design, spacecraft navigation, guidance and control using Java or Matlab.0 weekly downloads
The Math Description Engine Software Development Kit (MDE SDK) lets you auto-caption graph displays on the fly, making computer-rendered graphs accessible to blind and visually-impaired users. More information at prime.jsc.nasa.gov0 weekly downloads