This database has full-text academic articles in almost every subject, including quite a few peer-reviewed and scholarly journals. A good choice for almost any topic.
Gale eBooks has reference encyclopedias that you can view online, which are useful for giving you a brief overview and important aspects of your topic.
DT+ includes study guides, recordings of theatre, ballet, opera and classical music. Includes interviews with actors and crews, as well as relationship maps, plot summaries, theme and context analysis, glossaries.