One-volume encyclopedia to all aspects of classical antiquity. 3rd ed. 1996. Edited by Simon Hornblower and Antony Spawforth. See here for its list of abbreviations of both scholarly journals and classical works.
Annotated bibliographies of the most recent and authoritative classical scholarship.
Texts of the major Greek authors linked to dictionaries, English translations and commentaries.
Main index to the scholarship of classical studies published in all languages in both books and journals.
Texts of Latin literature spanning the Classical, Patristic, Medieval, and Neo-Latin periods. A separate database, LLT-Series B, includes primarily additional medieval sources, but some classical and late antique as well (e.g., the Institutiones and Digesta of the Corpus Iuris Civilis). For a database of the classical texts with a simpler interface see Classical Latin Texts, the online version of the PHI CD-ROM.
Texts of Greek literature from Homer (8th century BCE) to the fall of Constantinople (1453 CE).
50 high-resolution maps of the ancient world freely available for download. See Pleiades for a database of geographic information related to the Greco-Roman world linked to Google Maps.
Full text--minus forewords, textual apparatus, and indices--of editions of texts from the Latin series of the Bibliotheca scriptorum Graecorum et Romanorum.