These are some of the digitization projects to provide access to resources in original languages for medievalists.
The aim of the publishing program of the Monumenta Germaniae Historica, going back to the early nineteenth century, is to provide scholarly editions of all documents pertaining to the history of medieval Germany including relations with other countries. All MGH publication in print for more than five years are accessible online.
Ut per litteras apostolicas is the electronic version of the registers and letters of the thirteenth- and fourteenth-century popes
Corpus Corporum is an ongoing project at the University of Zurich meant to provide a platform for publishing and access to searchable Latin texts including the Patrologia Latina and Aristotelis Physica, ten Latin translations of Aristotle's Physics.
http://digitizedmedievalmanuscripts.org/is an ongoing, crowdsourced project that maps digitized manuscript collections worldwide from the small, 10 or fewer digitized manuscripts to large with links to the digital collections' home sites.
The Parker Library contains digital images of most of the manuscripts in the Parker Library of Corpus Christi College, Cambridge University with detailed descriptions of the manuscripts as well as the images of them.
Digital Scriptorium provides a central access point to selected images from scattered collections with special emphasis on manuscripts signed and dated by scribes.