"The History Data Service collects, preserves, and promotes the use of digital resources, which result from or support historical research, learning and teaching." This says that it's open access, but on closer inspection you need an Athens login (only available if you're attached to an institution which pays for it). Would be great if you could get in, though, I'd imagine.
The History Data Service collects, preserves, and promotes the use of digital resources, which result from or support historical research, learning and teaching.
Another great site on things archaeological. Archaeologists seem to be making even better use of the possibilities the net has opened up than historians. This site provides some good quality, free services.
A site which sells images of ads from the twentieth century, however each image opens with a link that contains a large copy of the image which can then be downloaded for free. It seems to be an enormous collection.
This online collection offers important historical perspectives on the science and public policy of epidemiology today and contributes to the understanding of the global, social-history, and public-policy implications of diseases.
A site with primary sources that also guides students in source analysis/evaluation. It's run by George Mason University (they do a lot of the heavy lifting when it comes to open-access digital history. Good on 'em!).