- AstroWeb: Astronomy/Astrophysics on the Internet
- The World-Wide Web Virtual Library: Astronomy
- ADS Astronomical Abstract Search Engine
- ADSCatalog Query Service
- Astrophysics Preprint Archive
- ISSA Infrared Images from IPAC
- NASA/IPAC Extragalactic Database
- SIMBAD astronomical database
- The Star*s Family of Astronomy and Related Resources
- Astronomical Data Center
- Canadian Astronomy Data Center (CADC)