The Internet Sacred Text Archive "...is a freely available archive of electronic texts about religion, mythology, legends and folklore, and occult and esoteric topics. Texts are presented in English translation and, where possible, in the original language."
The Library of Congress has a treasure trove of artifacts. Below is information on a few of its collections.
This is a great source for finding both state and federal legal information (statutes, regulations, & case law). The state statute by topic page is especially helpful.
The Miller Center's Presidential Speeches Archive has speeches dating back to 1789.
Use ARDA to find religion data.
Pew Research Center collects and publishes a wide range of data related to religion and public life.
"The Stanford Encyclopedia of Philosophy organizes scholars from around the world in philosophy and related disciplines to create and maintain an up-to-date reference work."