Web Sites
Diplomaticcorp
diplomaticcorp.com is a Diplomacy community that offers standard and variant Play-By-Email and Live games. Approximately 100 variants are documented and playable. Also home to the DipWiki, the first online community-content-driven strategy and variant library. All games are run by a human GM (game master), no automated systems. Besides having colorful graphics, maps, a large database and player stats, there's also a wide-ranging forum for games and related topics of interest.
Diplomiscellany
Diplomiscellany is a Diplomacy web site run by David Cohen containing the Model House Rules for Non-Judge Email Diplomacy, the home pages of several variants, including Maharajah, Known World 901, Western World 901 and Mandate Of Heaven, articles on Diplomacy play and philosophy of gaming, and more.