Copernicus
NASA’s high-fidelity trajectory design and optimization system for Earth, lunar, libration-point, and interplanetary missions.
PyKEP
ESA’s open research toolbox for interplanetary trajectory design, Lambert problems, and low-thrust optimization.
NASA/JPL SPICE Toolkit
NASA/JPL’s free toolkit and data system for mission geometry, ephemerides, observation planning, and science operations.
FreeFlyer
Commercial astrodynamics software for space mission design, analysis, and operations across the mission lifecycle.