The Shakespeare Quartos Archive
According to the site, "The Shakespeare Quartos Archive is a digital collection of pre-1642 editions of William Shakespeare's plays. A cross-Atlantic collaboration has also produced an interactive interface for the detailed study of these geographically distant quartos, with full functionality for all thirty-two quarto copies of Hamlet held by participating institutions.
The Shakespeare Quartos Archive—Hamlet Prototype Here you can view full cover-to-cover digital reproductions and transcriptions of thirty-two copies of the five earliest editions of the play Hamlet. You can view quartos separately, or alongside any number of copies. You can search, annotate, make public or private sets of annotations, create exhibits or character cue line lists, and download and print text and images."