Use SearchWorks, it is the Stanford Libraries catalog and it is helpful to find books, articles, journals, microfilm, DVDs, archival materials, special collections manuscripts, digital contents and more. When you get in, utilize the menu on the left hand column to Refine your results by choosing Access and limit your results to online resources only, or limit your search by dates, format, language, etc.
Dissertations & Thesis, most Stanford dissertations written between 1989-2009 are available as PDFs from ProQuest and can be accessed directly from Dissertations & Theses@Stanford. Dissertations written after 2009 are available digitally in SearchWorks. The ProQuest Dissertations & Theses Global database is the largest single repository of graduate dissertations and theses. It includes 3.8 million works, with deposits from universities in 88 countries. See also a full listing of other dissertation databases.
These sites provide open access (at no cost) to scholarly journals in the social sciences and humanities. Coverage varies from title to title and can range from just table of contents, to partially/fully digitized older issues, with some journals having a moving wall limiting access the most recent issue.