Texts
English
Christian Classics Ethereal Library - major works of Augustine, but in an older translation
New Advent - helpful delineation of Augustine's works situated within a larger encyclopedia. The translations are mostly older, and the encyclopedia itself is too dated to use as an interpretive resource.
Latin
Sant' Agostino - the complete works of Augustine as found in the Migne edition of Patrologia Latina
The Confessions of St. Augustine - An electronic edition of J. O'Donnell's 3-volume text and commentary
Finding Sources
Finding Augustine - thorough, topical, searchable bibliographic database
Augustine & the Latin West - select annotated bibliography divided by sub-topic, compiled by William Harmless
Research Materials - annotated guide to Augustine research by J. O'Donnell
General Information
Augnet - reference site for St. Augustine and the Augustinian Order
Stanford Encyclopedia of Philosophy - general entry weighted toward Augustine's significance for philosophy
Internet Encyclopedia of Philosophy - general entry in a peer-reviewed online encyclopedia