• The American Association of Variable Star Observers (AAVSO) - largest organization of variable star observers worldwide, their pages contains observations and information on many variable stars
• Binary Stars - A Primer for the Beginner - information about Binary Star Systems
• Binary Stars - free astronomy software for Macintosh computers - software about binary stars, and a lot more
• Eclipsing Binary Stars - information about Eclipsing Binary Star Systems
• Eclipsing Binary Stars: A Simple Model for Computing Light Curves - for anyone interested in the technical/mathematical aspect of computing binary light curves
• General Catalog of Variable Stars (GCVS)
• Information Bulletin on Variable Stars (IBVS)
• Northern Sky Variability Survey
• RR Lyrae Data Archive - site containing tables of published photometric data for RR Lyr variables, including a summery of information from the General Catalog of Variable Stars

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