This site has debates from the UK House of Commons (I don't think The Lords is included) that go back at least to World War II. The purpose of the site is to raise public awareness, however it is useful to the historian as a source.
I'm not sure if this site has digitised medieval manuscripts there or if it functions as a search engine for the rest of the web, but either way it's a good place to find medieval primary sources.
An excellent collection of some important historical works, downloadable for free. Some people may lament that students won't read them anymore, but hey isn't it better than them just watching MTV? Controversial...
The Digital Librarian has no life. This is an enormous collection of sites which contain primary source documents on just about any aspect of modern history. Some gems in there.
The Library's collection of more than 500 broadsides is one of the largest recorded and the first to be digitized in its entirety. The examples digitized here span the years 1707 to 1891 and include accounts of executions for such crimes as arson, assault, counterfeiting, horse stealing, murder, rape, robbery, and treason. Many of the broadsides vividly describe the results of sentences handed down at London's central criminal court, the Old Bailey, the proceedings of which are now available online at http://www.oldbaileyonline.org.
"The Library's collection of more than 500 broadsides is one of the largest recorded and the first to be digitized in its entirety. The examples digitized here span the years 1707 to 1891 and include accounts of executions for such crimes as arson, assault, counterfeiting, horse stealing, murder, rape, robbery, and treason. Many of the broadsides vividly describe the results of sentences handed down at London's central criminal court, the Old Bailey, the proceedings of which are now available online at http://www.oldbaileyonline.org." Always good to find sources on one's ancestors...
Studies in Scarlet presents the images of over 420 separately published trial narratives from the Harvard Law School Library's extensive trial collections.
This is a search engine which scans a collection of primary source websites for open access sources. They purport to focus on American and British literature.
Of course these comrades have no ulterior motives in providing the material. Of course. DEATH TO THE CAPITALIST PIGS! Of course. Still valuable as a source of historical information though.
An enormous collection of links covering a wide array of regions and all time periods. It has primary texts, maps, diagrams, statistics, all types of historical sources. Well-organised and searchable.
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British History Online
British History Online is the digital library containing some of the core printed primary and secondary sources for the medieval and modern history of the British Isles. Created by the Institute of Historical Research and the History of Parliament Trust, we aim to support academic and personal users around the world in their learning, teaching and research." Syas it all, really.
This is where using the net gets tricky for students. We tell them never to use wikis (for good reason) and then something like this comes along. It's awesome. A fast-growing wiki (a site that anyone can add to) of historical sources. Shows why we need something like Diigo to filter the internet and provide guidance for the students regarding what to use in their research. Run by the same people as Wikipedia (Wikimedia). If you're ever looking for historical images can I suggest Wikimedia Commons.