Theatre Netsearch, maintained by DBM (Donald B. Murphy, Georgetown University.) Excellent links to every imaginable aspect of the theatre, at times made mind-numbing by a lack of coherent page design. But the content makes it worth the wade-through.
Theatre Studies Research Guide, Yale University. Rich in links.
Theatron. This site, based in the UK, has an excellent link to 3D drawings of Florimène, as well as similar drawings of theatres in the classical world. To access these links, click "Gallery" on the homepage. It is also the link to major UK and European activity in the field of Virtual Reality and 3D architectural imaging. A very fine site.
Theatrum. This Spanish site has excellent links to theatres and performance activities throughout the world.
This Month in Theatre History an interesting site maintained by Professor Richard Finkelstein (University of Denver). Day by day listing of theatre events of the month, past and present, with links to history, music, dance and theatre library and research resources.
WWW Virtual Library: Theatre and Drama -- Theatre Images. Illustrations from throughout the theatre world.
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University of Maryland University Libraries: Theatre. "This is a guide to the important reference sources for research in the field of Theatre."
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Vitruvio.ch Links to sites presenting general history as well as theatre historical sites -- e.g., the Teatro Farnese, in a 360 degree panoramic virtual tour. Excellent pictorial resources for virtual every century.
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USITT's Wading On the Web (WOW)
Worthwhile Links, an eclectic collection of links related to the Arts, Children, General Humanities, Literature and Culture, Science and the Social Sciences.