Astropy
The community-developed core Python package for astronomy, coordinates, time, units, tables, and scientific data.
ESA SNAP
ESA’s open-source desktop platform and toolboxes for processing Sentinel and other Earth-observation data.
Orfeo ToolBox
An Apache-licensed toolkit from CNES for large-scale remote-sensing image processing in C++, Python, and command-line workflows.
QGIS
A free and open-source geographic information system widely used for Earth-observation and geospatial analysis.
CesiumJS
An Apache-licensed JavaScript library for high-precision 3D globes, time-dynamic visualization, and geospatial web applications.
Skyfield
A production-stable MIT-licensed Python library for precise positions of planets, stars, and Earth satellites.