The Confessions (Latin: Confessiones) is a work by St Augustine, written between 397 and 400 CE, recounting his conversion to Christianity. It is often regarded as founding the genre of autobiography.
Free online texts
Christian Classics Ethereal Library: The Confessions and Letters of St. Augustine, with a Sketch of his Life and Work. Confessions translated by J.G. Pilkington. Multiple formats.
Georgetown University: The Confessions of Augustine - An Electronic Edition. Latin text with commentary by James J. O'Donnell. HTML format.
Georgetown University: Augustine's Confessions, translated by E.B. Pusey. TXT format.
Gutenberg: The Confessions of St Augustine. Multiple formats.
Latin Library: Augustine of Hippo, Latin texts.
University of Adelaide (Internet Archive): The Confessions, translated by E.B. Pusey. EPUB, HTML and MOBI formats.
Wikisource: Confessions, translated by Albert Outler. Multiple formats.
Wikisource: Confessions, translated by J.G. Pilkington. Multiple formats.
BBC Radio 4 In Our Time: Augustine's Confessions. Melvyn Bragg with Kate Cooper, Morwenna Ludlow and Martin Palmer.
History of Philosophy without any gaps: Life and Time: Augustine's Confessions - podcast by philosopher Peter Adamson.
PhilPapers: Augustine - bibliography with open access option.
Wikipedia: Confessions (Augustine).
Further reading at Tom's Learning Notes
Augustine: The City of God.
Latin resources: Learn to read Latin texts in the original.
Bloom's Western Canon: The Confessions is listed.