Humanities & Social Sciences
History: Science

Pathfinders

Echo: Exploring and Collecting History online: Cataloging, Annotating and Reviewing Sites in the History of Science Technology and Medicine
This is a massive well-organized guide to History of Science, Technology and Medicine Websites.
Science and Creationism
A Pathfinder site from the National Academy of Sciences.

Full-Text Sites

The Thoemmes Encyclopedia of the History of Ideas
An online biographical and bibliographical encyclopedia in European and American Intellectual history. Seems especially strong in history of philosophy and history of Science.
Catalog of the Scientific Community in the 16th and 17th Centuries
"This catalog is a collection of 631 detailed biographies on members of the scientific community during the 16th and 17th centuries with vital facts about each individual and their contributions to science." Material was originally compiled and organized by the late Richard Westfall.
Core Historical Literature of Agriculture
AVISTA
Association Villard de Honnecourt for Interdisciplinary Study of Medieval Technology Science and Art.