Museums and Public Art Galleries:
Art Institute of Chicago Collection Database 2 works by Santi di Tito online
Fine Arts Museums of San Francisco Female Nude Archer
J. Paul Getty Museum, Los Angeles Resurrection, drawing, ca.1568
Kress Foundation Collection NEW! (Look for the "Image" links for super high resolution scans) Portrait of a Boy in Red, ca.1570-80
Kunsthistorisches Museum Databank, Vienna (in German) 
Santi di Tito in the Louvre Museum Database, Paris (only available in French) Homme nu, drawing
Courtauld Institute of Art, London, UK Resurrection, pen and ink
Courtauld Institute of Art, London, UK Entombment, pen and ink
Drawings from the Biblioteca Ambrosiana, Milan
Harvard University Art Museums, Massachusetts
Musée Fesch, Ajaccio, France Series of 5 paintings
State Museums of Florence Digital Archive, Italy
The Walters Art Museum, Maryland NEW!
Pictures from Image Archives:
Santi di Tito in the Web Gallery of Art 
Wikimedia Commons Image Database 
Bildindex der Kunst und Architektur (in German)  (a welcome screen is displayed for a couple of seconds before the search results appear)
Ciudad de la Pintura (in Spanish) 
Articles:
Union List of Artist Names (Getty Museum) Reference sheet with basic information about the artist and pointers to other references.
Wikipedia, the "Open Content" Encyclopedia
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