Greek and Latin Dictionaries
Lewis, An Elementary Latin Dictionary at Perseus Digital Library
Greek and Latin Texts
Bibliotheca Augustana (Greek, Latin, and other texts)
Perseus Digital Library (Greek and Latin). Click on words for grammar and vocabulary listings
The Latin Library (Latin only)
Lacus Curtius contains translations and original texts of many Roman historical works.
The Chicago Homer is a bilingual database for Homer's Iliad and Odyssey. It also contains the works of Hesiod and the Homeric Hymns.