you have come to the right place, fellow manuscript peruser...

highlights (single books)

• the black hours
• the crusader bible
• the hours of jeanne d'evreux
• the belles heures
• i would put the book of kells on here but the link is apparently broken. sad!

• digitized medieval manuscripts database
  database of online libraries with digitized manuscripts, so a collection of collections. has a "random library" button if you feel overwhelmed.
• the morgan library
  good place to start for whole books from the middle ages/early modern era. interface is nice and simple.
• getty
  great if you just want to browse illustrations
• digital library of medieval manuscripts
  johns hopkins university collection, has helpful thumbnails on its search page
• digital bodleian
  manuscripts from all around the world
• cambridge digital library
  has many collections, grouped by language and topic
• wren digital library
  trinity college collection of european manuscripts, nice search system
• goodspeed manuscript collection
  greek, syriac, ethiopic, armenian, arabic, and latin manuscripts from the 5th–19th centuries
• KBR digitised collection
  royal library of belgium collection
• irish script on screen
  largest digital collection of irish manuscripts

digitized manuscript collections