Orfeo ToolBox
An Apache-licensed toolkit from CNES for large-scale remote-sensing image processing in C++, Python, and command-line workflows.
NASA/JPL SPICE Toolkit
NASA/JPL’s free toolkit and data system for mission geometry, ephemerides, observation planning, and science operations.
NASA Core Flight System (cFS)
NASA Goddard’s open-source flight-software framework bundle and common applications for spacecraft systems.
F Prime
NASA/JPL’s component-driven, open-source framework for spaceflight and embedded software applications.
NASA Operational Simulator for Space Systems (NOS3)
A NASA open-source digital-twin and software-simulation environment for spacecraft integration and test.
NASA Trick Simulation Environment
NASA’s open simulation environment for model integration, execution control, data recording, and analysis.
Yamcs
An open-source mission-control framework for telemetry, commanding, automation, and spacecraft operations.
SatNOGS
An open-source global satellite ground-station network, client stack, and public transmitter database.
Skyfield
A production-stable MIT-licensed Python library for precise positions of planets, stars, and Earth satellites.
FreeFlyer
Commercial astrodynamics software for space mission design, analysis, and operations across the mission lifecycle.