In regard to online Latin:
The National Library of Israel has put a large number of documents online written by Isaac Newton about religion, which was a major subject of research for him, especially in Later life. Much of these are in Latin, with Greek and Hebrew, the three Classical languages in those days. Newton Manuscripts http://dlib.nli.org.il/R/?func=collections&collection_id=7856 The subjects are rather arcane and may seem a bit odd by our standards. The documents are in digital form and in straight text–“normalized” and “diplomatic,” which latter seems to include mistakes and crossouts, etc.
This was reported by the BBC on the World Service, and here’s a video about the subj.: http://jn1.tv/video/culture/?media_id=10766
While looking for this, I noticed that Cambridge University uploaded quite a few Newton documents in December, but other than seeing a print copy of the Principia I haven’t had a chance to look.