Orlando Furioso (English: The Rage of Roland) is an Italian epic poem by Ludovico Ariosto, published between 1516 and 1532. It is a contuation of Boiardo's Orlando Innamorato, and continues its adaptation of legendary matter from the Matter of France, recounting the sturggle between Charlemagne's paladins and the saracens. It's popularity, and wide influence in European literature, largely eclipsed that of the earlier work.
Free online texts
Gutenberg: Orlando Furioso, translated by William Stewart Rose. Multiple formats.
Online Medieval and Classical Library (Internet Archive): Orlando Furioso. HTML format.
University of Adelaide (Internet Archive): Orlando Furioso, translated by William Stewart Rose. Multiple formats.
Wikisource: Orlando Furioso, translated by William Stewart Rose (currently incomplete). HTML and other formats.
Gutenberg: Orlando Furioso. Multiple formats.
Libero: Orlando Furioso. HTML format.
Wikisource: Orlando Furioso. HTML and other formats.
Gutenberg: Stories from the Italian Poets: with Lives of the Writers, Volume II, by Leigh Hunt. Multiple formats.
Gutenberg: Ariosto, Shakespeare and Corneille, by Benedetto Croce. Multiple formats.
Librivox: Orlando Furioso, translated by John Harington. Public domain audiobook.
The Great Conversation: Further reading at Tom's Learning Notes
Matteo Maria Boiardo: Orlando Innamorato
Torquato Tasso: Jerusalem Delivered
Harold Bloom's Western Canon: Orlando Furioso is listed