Roman

CoinArchives.com
Searchable archive of ancient coins sold through major auction houses with images and catalogue text.
http://www.coinarchives.com/a/

Coins of Roman Egypt
Collection site dedicated to Roman coins of Ancient Egypt, with search function.
http://www.coinsofromanegypt.org/

Dave's Ancient Coins Page
Site to engage collectors new and experienced into the joys of collecting ancient coins.
http://www.garstang.us/DavesCoins.html

Eight Hundred Years of Roman Coinage
Article by numismatist David R Sear, with images.
http://www.chicagocoinclub.org/projects/PiN/rc.html

Imitations of Roman Republican Denarii
Discusses and illustrates Dacian, Celtic and other imitations of Roman Republican denarii, both good-silver and plated coins.
http://rrimitations.ancients.info/index.html

Jencek's Obverse Legends
Alphabetical list to help identify the Roman emperor who had the coin minted.
http://ancient-coins.com/legends/legends.htm

Kevin's Coins
A site for new collectors of ancient Roman coins. It features cleaning and photography tips, and photos of a private coin collection.
http://kevinscoins.ancients.info

Not in RIC. Addenda and Corrigenda
Addenda and Corrigenda to volumes VI and VII of "The Roman Imperial Coinage" (RIC). Not listed coins and known errors.
http://www.notinric.info

RPC Online: Roman Provincial Coinage project
Online Data base on Roman Provincial Coinage of the Antonine period
http://rpc.ashmus.ox.ac.uk/project/