CORE is a full-text, interdisciplinary, non-profit social repository designed to increase the impact of work in the Humanities. It includes articles, databases, syllabi, and much more, on a wide range of subjects in the humanities.
Topicgraph is a beta tool built by JSTOR Labs as part of its "Reimagining the Monograph" project. It helps you explore scholarly books by letting you understand at a glance all the topics covered within a book and then navigate directly to those pages about topics you are researching. The site includes a small collection of open access scholarly books from a variety of disciplines.