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• AAVSO - American Association of Variable Star Observers
• Astronomical Society of Southern Australia - Variable Star Group
• BAA Variable Star Section
• BAV - Bundesdeutsche Arbeitsgemeinschaft fur Veranderliche Sterne
• CBA - Center for Backyard Astrophysics
• IAPPP
• IAU Commission 27: Variable Stars
• VSNET - Variable Star Network

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• Dan Bruton's Eclipsing Binary Page

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• McMaster Cepheid Photometry and Radial Velocity Archive
• David Dunlap Observatory Database of Galactic Classical Cepheids
• Siobahn Morgan's Archive of Fourier Coefficients

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• Be Star Newsletter
• delta Scuti Star Newsletter
• General Catalog of Variable Stars - form interface
• Information Bulletin on Variable Stars (IBVS)

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• AGAPE
• ASAS - All-Sky Automated Survey
• EROS Project
• HCO - Harvard College Observatory Archival Photometry of the LMC and SMC
• MACHO Project
• MOA
• OGLE Project
• PLANET Project
• SDSS - Sloan Digital Sky Survey
• STARE - STellar Astrophysics and Results on Exoplanets
• TASS - The Amateur Sky Survey

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• Eclipsing Binary simulation [JAVA]

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• Calendar Date to Julian Date calculator [Javascript]
• CCDEZMAG
• EzPhot
• Julian Date to Calendar Date calculator [Javascript]
• HEASARC Date Conversion calculator
• Muni-DOS (Programs for CCD Photometry on a PC)

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• Database of RR Lyrae Observations
• Karl Dubost's "Variable Stars Database Tools" Page
• Chris Lloyd's "Random Variable" Page
• Brian Skiff's "Precise Positions for Landolt Standard Stars"
  
  • Notes for Landolt Standards

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