An "evolving digital library of resources for the study of the ancient world and beyond." Contains full text of the writings of many ancient philosophers.
Offers versions of some classics of early modern philosophy, and a few from the 19th century, prepared with a view to making them easier to read while leaving intact the main arguments, doctrines, and lines of thought.
EEBO contains searchable and browsable page images of virtually every work printed in the English-speaking world from 1473 to 1700, as well as some items printed after 1700.
Searchable and browsable page images of every significant title printed in the United Kingdom, along with thousands of important works from the Americas, between 1701 and 1800; includes books, pamphlets, broadsides, and ephemera.
Large collection of digitized books. Especially powerful because you can search inside the full text. You can also create an ngram of an individual word across the corpus.