Greek and Roman Inscriptions

Greek Inscriptions
Inscriptiones Graeca
Attic Inscriptions Online (AIO)
The Inscriptiones Christianae Graecae
Corpus Inscriptionum Latinarum (CIL)
Roman Epigrahic Database (Heidelberg)
Epigraphic Database Rome (EDR)
Propylaeum, Fachbibliothek Altertumswissenschaften
Roman Inscriptions of Britain