- The Amateur Sky Survey (TASS)
- American Association of Variable Star Observers (AAVSO)
- American Lunar Society
- Association of Lunar & Planetary Observers
- Astronomy and Astromicroscopy
- Center for Backyard Astrophysics
- Dutch Meteor Society
- Galilean Satellite Eclipse Timings
- Grup d'Estudis Astronomics (Spain)
- International Amateur-Professional Photoelectric Photometry (IAPPP)
- International Meteor Organization
- International Occultation Timing Association (IOTA)
- IOTA Asteroid Occultation Section
- International Supernovae Network
- Nordic Mars Observers
- North American Meteor Network
- Society of Amateur Radio Astronomers (SARA)
- Society for Astronomical Science
- Solar Eclipse Web Pages
- Steve's High Energy Astronomy Site
- Visual Satellite Observers
- VSNET -- Variable Stars, Novae, and Supernovae
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