"This is a collection of hyperlinks to digitized editions of source-documents and literature concerning early medieval Europe that can be found on the internet today. Sources listed here are all available to the public, free of charge. Currently there are 3696 entries in this collection. "
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/
This is an interesting site which has a map of archaeological sites from medieval Europe and you can browse them to look at the acculturation of the Germanic invaders/immigrants at the end of Ancient period. Will be useful for student research.
Has some small excerpts from medieval texts with accompanying translation and explanation. Not a whole lot there (unless you pay for premium access...) but would be useful for student research into medieval Britain/Constantinople/Vikings). Some pretty images for classroom resources there, too.
A database of archaeological finds of medieval badges and ampulla in Europe. It takes you to a map where you can search for them. Admission - I don't know what an ampulla is. Sounds cool though, doesn't it?
This site is briliant! A bunch of exemplary librarians maintain a list of high-quality sites which can be used for historical research on Europe. It's especially good for World War One but also some of the smaller European countries which are often hard to find information on.
A set of digital source collections centring mainly on alcohol and society, music, New Jersey, Italy, Late Medieval period, women and environmentalism.