Links last checked Sept. 26, 2022
Full Numismatic Books Online (most downloadable)
Educational sites (in no particular order)
CoinArchives.com is a repository of coins previously featured in major numismatic auctions. (Rather limited unless you pay for the Pro version)
http://www.muenzgeschichte.ch/ The Winterthur Coin Cabinet
http://www.snible.org/coins/hn/ Historia Numorum, the famous manual of Greek Numismatics by Barclay V. Head
Svoronos online (the comprehensive Ptolemaic coinage reference)
Wildwinds The WildWinds website has been created as a reference, attribution and valuation resource in the field of ancient numismatics.
https://www.inumis.com/ iNumis offers a large number of reference works on coins, for free online consultation.
http://donum.numismatics.org ANS Library Catalog Search
Calgary Coins Some interesting articles
Virtual numismatic exhibition of gold coins in the Catholic University, Milan (in Italian)
Commercial sites with added value
VCoins - The Online Coin Show with links to many dealers' holdings. Excellent for finding photogenic specimens
CGB.fr French site with English version. A nice section on fakes.
Forum Ancient Coins. Articles and useful resources in addition to a commercial section
A selection of museums with important holdings of ancient coins and numismatic institutions
https://www.imj.org.il/en/collections?departmente=2101501 The Israel museum collections: special topics
https://www.eretzmuseum.org.il/e/116/ The Kadman Numismatic Pavilion
Around the world:International Numismatic Council: Links to coin cabinets
https://www.inc-cin.org/coin-cabinets.html (go there for most major collections plus some more obscure ones)
Collections not listed in the INC site:
Santander Bank Collection (Spain) (Fancy Flash site)