WorldCat is the world's largest library catalog, helping you find library materials online.

RKD Explore is a search tool by the RKD. It combines several databases: RKD Artists, RKD Images, RKD Portraits, RKD Library, RKD Archives, RKD Collections and RKD Excerpts.

Art and Architecture is an image database and research tool, powered by the Courtauld Institute of Art.

The Atlas database covers all the works exhibited in the museum - some 30,000 items.
Internet users, like museum visitors, will find the usual explanatory texts that accompany museum exhibits, compiled under the authority of the museum curators.

The Gothic Ivories Project is an online database of ivory sculptures made in Western Europe ca. 1200-ca. 1530 and neo-Gothic ivory pieces.

Le catalogue regroupe plus de 500.000 notices d'objets de toute nature (archéologie, beaux-arts, ethnologie, histoire, sciences et techniques...) valorisées par des parcours thématiques, des zooms et des expositions virtuelles.

Joconde est le fruit d'un partenariat constant entre le bureau de la diffusion numérique des collections du service des musées de France et les musées participants.
L'espace professionnel propose de nombreuses fiches de conseils consacrées à l'informatisation et à la numérisation des collections. La rubrique "Musées en ligne" offre une sélection des ressources numériques muséales du monde entier (bases de données, expositions virtuelles, sites remarquables).

Medieval Memoria Online provides a database that is accessible free of charge for researchers, students and anyone with a general interest in Dutch cultural heritage. It contains inventories and descriptions of objects and texts that had a function in the commemoration of the dead in the area that is currently the Netherlands, until 1580. These are:

Tomb monuments and floor slabs
Memorial pieces (Memorialbilder)
Memorial registers (administrative and liturgical sources)
Narrative sources that fulfilled functions in the commemoration of the dead

The database also contains basic information on the institutions in which the sources functioned.

A database of medieval choir stalls and misericordia

Since 2005 a database of choir stalls and misericords in Western Europe has been developed.

Choir stalls are part of the fixed church furniture in medieval monasteries and collegiate churches and were made in the period from 1150 to 1550 throughout Western Europe. The choir stalls are constructed from one or two rows of wooden seats, placed on the north and south side of the choir and possibly also on the west side. The folding sessions of the seats on the bottom have a console-like support, called a misericord. This word is derived from the Latin word misericordia that means mercy. During the periods in which canons and monks had to stand the misericord offered support. Parts of the choir banks, such as the misericords, are frequently decorated with carvings. Mainly religious scenes are to be found on the cheeks. This is in contrast to the carving of the misericords and the buttons where the profane world dominated with displays of fantasy creatures, human types, animals, proverbs and fables. Situated in the centre of the religious world the carvings give an idea of the way of thinking and acting in daily life of in the Middle Ages. The CKD has several collections of images - the collection J. Verspaandonk, the collection Muck and the collection Van Aalst.

The Bildindex provides approximately 2 million photographic reproductions of art and buildings in Germany and Europe.

Iconclass is a classification system designed for art and iconography. It is the most widely accepted scientific tool for the description and retrieval of subjects represented in images (works of art, book illustrations, reproductions, photographs, etc.) and is used by museums and art institutions around the world.