| ADS | Digital Library for Physics and Astronomy |
| SIMBAD | Astronomical Database |
| DSS | Digitized Sky Survey |
| ALADIN | The Aladin Interactive Sky Atlas |
| TOPCAT | Tool for Operations and Catalogues and Tables |
| HEASARC | High Energy Astrophysics Science Archive Research Center |
| MAST | Multimission Archive |
| NIST | National Institute of Standards and Technology |
| NUDAT | National Nuclear Data Center |
