Orfeo ToolBox
An Apache-licensed toolkit from CNES for large-scale remote-sensing image processing in C++, Python, and command-line workflows.
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.
OpenC3 COSMOS Core
A free, source-available command-and-control stack for hardware integration, telemetry, commands, scripts, and dashboards.