From the Perseus site (accessed 2005-07-25):
Perseus is an evolving digital library, engineering interactions through time, space, and language. Our primary goal is to bring a wide range of source materials to as large an audience as possible. We anticipate that greater accessibility to the sources for the study of the humanities will strengthen the quality of questions, lead to new avenues of research, and connect more people through the connection of ideas."
As of 2014, the number of Classics words in Perseus amounts to 69 million. The library also contains dictionaries, reference works, translations, and commentaries in other modern languages, such as Croatian, German, French and Italian.
In April 2013, the Perseus Digital Library joined forces with the Open Greek and Latin project at the University of Leipzig.
From Wikipedia (accessed 2014-12-02):
The Perseus Project (also known as the Perseus Hopper) is a digital library project of Tufts University, which is located in Medford and Somerville, near Boston, in the U.S. state of Massachusetts. The project assembles digital collections of humanities resources. It is hosted by the department of Classics. Suffering at times from computer hardware problems, its resources occasionally are unavailable. The project is mirrored by the Max Planck Society in Berlin, Germany, as well as by the University of Chicago.
The project was founded in 1987 to collect and present materials for study of ancient Greece. It has published two CD-ROMs and established the Perseus Digital Library on the World Wide Web in 1995. The project has expanded its original scope. Current collections cover Greco-Roman classics and the English Renaissance. Other materials, such as the papers of Edwin Bolles and the history of Tufts University, have been moved into the Tufts Digital Library.
The editor-in-chief of the project is Gregory Crane, the Tufts Winnick Family Chair in Technology and Entrepreneurship.