Thomas Willeboirts art links 

Kunsthistorisches Museum Databank, Vienna (in German)  

Louvre Museum Graphic Art Database, Paris (in French)   NEW!  

Mauritshuis Royal Picture Gallery, The Hague   NEW!
Great scans of Mauritshuis paintings, from the 'Memory of the Netherlands' project

Rijksmuseum, Amsterdam   NEW!
Great scans of Rijksmuseum paintings, from the 'Memory of the Netherlands' project

Rijksmuseum Research Database, Amsterdam (in Dutch)  

Crocker Art Museum, California
Venus and Adonis

Thomas Willeboirts in the Los Angeles County Museum of Art Database
The Holy Family

Norton Museum of Art, West Palm Beach, Florida - Provenance Research
Virgin and Child with Music making Angels

State Museums of Florence Digital Archive, Italy

 
National Art Databases and Museum Inventories:

Art Fund for UK Museums

Flemish Art Collection Database, Belgium (in Dutch)  

UK National Inventory of Continental European Paintings (NICE)   NEW!

 

World Visit Guide (formerly Insecula)

Ciudad de la Pintura (in Spanish)  

 

Union List of Artist Names (Getty Museum)  
Reference sheet with basic information about the artist and pointers to other references.

Artnet Magazine
A Bacchanale