Freely accessible web search engine that indexes the full text or metadata of scholarly literature across an array of publishing formats and disciplines. This site is a great aggregator of scholarly research, but access to articles is limited; however, you will be able to access many of the articles if you link to W&M Libraries within Google Scholar. See below for instructions.
Here's one handy set of instructions for always having W&M access through Google Scholar, whether you're on campus or not. Set it up in your browser once, and it should stay with you throughout your college career.