Paintings in Museums and Public Art Galleries:
Joseph-Nicolas Robert-Fleury in the Louvre Museum Database, Paris (only available in French)
Flemish Art Collection Database (in Dutch) 
Musée des Augustins, Toulouse, France
State Museums of Florence Digital Archive, Italy
The Essence of Line: French Drawings from Ingres to Degas
The Wallace Collection, London, UK 3 paintings online
Professional Tools:
Artprice
Pictures from Image Archives:
Bildindex der Kunst und Architektur (in German) 
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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