From the website: 

MEL’s Archive gives you direct access to the digital images, texts, and tools that we use to build our MEL editions. MEL’s textual core consists of an integrated set of scholarly fluid-text editions that, when fully realized, will allow you to navigate all versions of Melville’s works. Visitors to MEL’s workspaces can draw upon our Archive and Editions to create essays, presentations, exhibits, or classroom assignments.