The English Server provides full-text poems from Angelou to Wordsworth. Poetry is listed chronologically, by author, title, and index of first lines, and you may search by keyword, also. All 154 of Shakespeare's Sonnets , searchable by number or keyword. The Classics Archive features Greek and Roman texts searchable by author, title, and so on. The University of Virginia has an enormous French Collection online.
Some texts are only available to UV students.
Letteratura is an Italian site with all kinds of links to language and literature. The entire works of William Shakespeare are available in hypertext-searchable form. Links to other related sources are provided, too. Take a look at the Shakespearian Glossary. The largest public collection of literature online is available from Columbia University's Project Bartleby.