The Decretum Gratiani project sets as its goal the creation of an edition of Gratian’s Decretum. Though it is unclear whether the final edition will be digital or on paper, the project as of 2020 provides a PDF of a draft of the text with caveats for its use. There is also a list of manuscript sigla of the Decretum that link to outside repositories. However, many of the links in this list and elsewhere on the site are broken.
An Oxford-based research project, the Dictionary of Medieval Latin from British Sources is a dictionary of medieval Latin in the British Isles from 540CE to 1600CE based entirely on original research. Published through Brepolis, the online version presents the contents of the print dictionary in a searchable format. Drawing only on sources from the British Isles, the dictionary shows localized usages of Latin words.
There are two versions of the DMLBS. The free version is available through Logeion and can only be searched by keyword. The paid version published by Brepols has more extensive search features and is accessible through Brepolis. On that version, a user may create advanced searches that include or exclude terms as well as browse an index of headwords.
The Digital Charterbank of the Netherlands is a portal for searching all charters held in Dutch archives. Though the repository does not include images, it does offer links to the holding institution and descriptions of the materials. The website is presented in Dutch only. When available entries about charters are linked to images. You can navigate also from each entry to the finding aid of holding institutions.
Logeion is a free online dictionary that aggregates the resources of all the Latin and Greek dictionaries available through the Perseus Classical collection in addition to other resources like the Dictionary of Medieval Latin from British Sources. A user can search by headword or an inverse search and use the tabs to switch between dictionary sources, including: Lewis and Short, Gaffiot, and others. The website also provides basic corpus analysis, offering examples of the word in sentences as well as providing morphological analysis. Though not all sources in the project are medieval, some, like the Dictionary of Medieval Latin from British Sources, are predominantly medieval.