Various orbital mechanics :
- CNES space debris site
- Institut de Mécanique Céleste et de Calcul des Ephémérides (IMCCE)
- Heavens Above (astronomy, prediction...)
- Solar activity site (MSFC)
Data / practical information :
- International GNSS Service
- Bulletins IERS
- Earth Rotation Service
- Solar activity (NOAA)
- Generation of body ephemerides from the solar system (IMCCE)
- Celestrack (TLE NORAD)
International Organizations
Software :
- Free CNES software
- Mathematical source codes (netlib)
- Scilab
- Celestlab Library
- Orekit Library
- DAS - Debris Assessment Software (NASA)
- MASTER -Meteoroid and Space Debris Terrestrial Environment Reference (ESA)