Websites

GFHandel.org
Gerald Coke Handel Foundation
American Handel Society
Georg-Friedrich-Händel-Gesellschaft
London Handel Festival
Handel House, London (Handel & Hendrix in London)
Händel-Haus, Halle
Handel and Haydn Society
American Musicological Society
Göttingen Handel Festival
Karlsruhe Handel Festival
Handel Festival Japan
Czech Handel Society
BSECS (British Society for Eighteenth-Century Studies)
ASECS (American Society for Eighteenth-Century Studies)

Resources

Gerald Coke Handel Foundation: Online Catalogue
British Library Handel autograph MSS online
Staats- und Universitätsbibliothek Hamburg, Handel performing scores online
George Frideric Handel: Collected Documents
Ellen T. Harris (ed.), The Librettos of Handel’s Operas (Garland, 1989)
Handel opera database of performance history since 1705 (Händel-Haus Halle)
The English Concert: Handel for All