Ancient Coinage

Digital Library Numis (Open Access Publications)
Ancient Coinage, Wildwinds
Digital Iconographic Atlas of Numismatics in Antiquity (DIANA)

Historia Numorum. A Manual of Greek Numismatics
Hellenistic Royal Coinages
Seleucid Coinage
Ptolemaic Coinage
Coins of the Roman Empire (Ocre)
Roman Imperial Coins - Free online resource for collectors
Roman Numismatic Gallery
Roman Provincial Coinage