Paintings in Museums and Public Art Galleries:
Art Institute of Chicago Collection Database NEW! Supper at Emmaus
Fine Arts Museums of San Francisco Child Angel in niche with a candlestick
Kunsthistorisches Museum Databank, Vienna (in German) 
Peter de Witte in the Louvre Museum Database, Paris (only available in French)
Museum of Fine Arts, Boston  Paintings collection online
Courtauld Institute of Art, London, UK 2 works by or related to the artist
National Gallery of Victoria, Australia The Lamentation over the Dead Christ, ca.1585-86
State Museums of Florence Digital Archive, Italy
Professional Tools:
Artprice
Pictures from Image Archives:
Peter de Witte at Insecula
Bildindex der Kunst und Architektur (in German) 
California State University WorldImages Database 
Farbdia Archiv (Color Slide Archive) (in German)  Thousands of photographs of fresco cycles and wall decorations in churches and other buildings in and around Germany. Click "Galerie" for a normal overview; click "digilib" to zoom in.
Other Web Sites:
The National Ossolinski Institute This image through #73 are by de Witte
Articles:
Union List of Artist Names (Getty Museum) Reference sheet with basic information about the artist and pointers to other references.
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