It's a rather obscure topic but you never know, they might be useful for someone. Most of the manuscripts are partial and are from the Roman period in Egypt.
"A listing of over 5000 websites describing holdings of manuscripts, archives, rare books, historical photographs, and other primary sources for the research scholar."
Another one of the precious collections provided by that most excellent of libraries, Harvard University Library. It's so great that they don't just lock it up and be snobs. Good on them.
Women Working, 1800 - 1930 focuses on women's role in the United States economy and provides access to digitized historical, manuscript, and image resources selected from Harvard University's library and museum collections. The collection features approximately 500,000 digitized pages and image
A group of digital collections focussing mainly on audio recordings from the C20th, medieval manuscripts & images, pamphlets & drawings, photos and songs from World War II.
This is a guide to creating lessons using primary sources provided by the Library of Congress. They've just started a new initiative helping teachers use primary sources in the classroom; I went to the site they're set up but there wasn't much there. Maybe it will grow in time.
A series of links to Chinese history collections, provided by the National Library of China. There are a few dead links and the Chinglish can be amusing, but seems as though there are some useful sources in there for Chinese history.
"Mr. Lincoln's Virtual Library highlights two collections at the Library of Congress that illuminate the life of Abraham Lincoln (1809-1865), the sixteenth president of the United States. The Abraham Lincoln Papers housed in the Manuscript Division contain approximately 20,000 items including correspondence and papers accumulated primarily during Lincoln's presidency." Awesome.
Over 800 maps going back 500 years. Quality could be dodgy though - to be honest I didn't check. I've got bookmarkitis. Quality of comments is deteriorating. Need sleep.
"A listing of over 5000 websites describing holdings of manuscripts, archives, rare books, historical photographs, and other primary sources for the research scholar. All links have been tested for correctness and appropriateness."
This will only excite other Latinists out there. A very extensive collection of Latin sources from most regions in Europe. Bibliotheca Augustana multa bona magistris Latinae est!
The Centre for the Study of Ancient Documents, run out of Oxford. Seems to have an eclectic assortment of images of primary sources and translations from many Classical and early Medieval civilisations.
This site is a bit obscure (medieval Tibetan and all that) but has some images on Buddhism, Tibet, China and the Silk Road. It's from a site at Dunhuang, which is along the old Silk Road.
You'll need to be able to read German and Classical Latin, but once those minor hurdles are overcome this is a rich collection of primary sources on early German history. I only had a brief peek but it seems to focus on ancient & medieval Germany. I guess they're written in Latin as it was the lingua franca of Europe at the time. They're organised into books with chapters and indices so it's unlikely they were written in Roman times (or at least it seems so to me).
Actually, the MGH is a collection of sources mainly for medieval Germany (of course including areas that are not German today), initially started with the intent to create a complete edited version of sources for the middle ages. They are in fact organised by type, like legal documents, letters, chronicles, etc., whereas chronicles are also organised by author.
It's an invaluable reference for everyone doing work in medieval history. By the way, the link you saved doesn't work, I'd instead use this one: http://www.mgh.de/dmgh/