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American Association of Variable Star Observers - http://www.aavso.org
The largest organization for variable stars: provides professional and amateur collaboration, research, and analysis of variable star observations. |
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Information Bulletin on Variable Stars - http://www.konkoly.hu/IBVS/IBVS.html
The IBVS is a bulletin of Commissions 27 and 42 of the International Astronomical Union, published by Konkoly Observatory, Budapest, Hungary. |
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General Catalog of Variable Stars Research Group - http://www.sai.msu.su/groups/cluster/gcvs/
Research group working on the GCVS, Sternberg Astronomical Institute, Moscow, Russia. Includes catalogs and publications. |
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Astronomical Society of South Australia - http://www.assa.org.au/sig/variables/
ASSA's variable star group. News, FAQ, charts, and software. |
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Skyandtelescope.com - Variable Stars - http://skytonight.com/observing/objects/variablestars/
Observing variable stars. |