A Database

A Database is a pioneering open-source research engine and digital archive for contemporary visual culture.
http://www.adatabase.org/

Contemporary Culture Index

ccindex database is an online, open-access bibliographical database indexing international journals and periodicals. Areas covered are architecture, art, cinema, cultural studies, design, literature, music, philosophy, social sciences and photography.
http://ccindex.info/index.php

Getty Research Portal

The Getty Research Portal is a new free online gateway to digitised art history texts. A number of cultural institutions in both the US and Europe are contributing towards the project, which numbers nearly 20,000 searchable works.
http://portal.getty.edu/portal/landing