Books and Periodicals Online
Comprehensive directory of sources for abstracts, texts, journals, and more. Encompasses subjects such as business, law, science, and current events.
http://www.booksandperiodicals.com/
Gateway Service Center of Chinese Academic Journal Publications
Free resource for full-text Chinese language academic publications. By the East Asian Library of the University of Pittsburgh Library System.
http://www.library.pitt.edu/libraries/eal/Gateway-Home.htm
Genamics Journal Seek
Large and completely categorized database of open source journal information. Only serving as a gateway, this site does not maintain collections of articles or abstracts.
http://journalseek.net/
Periodicals Index Online
Portal to millions of articles published online, covering subjects in the arts, humanities, and social sciences.
http://pci.chadwyck.com/