18xx Rules Difference List
Includes an analytical list of rule differences among 18xx games. It covers most games and is maintained by Nick Wedd.
Andy's 18xx Page
Links and chronologies of some PBEM games.
Information on amateur, gamekits, and commercially available games. Features reviews, news, beginner's guide, and overview of existing games.
By Robert Jasiek. An urban game design. Features general and historical information.
Revenue calculator, and mapper applets for 1830, 1835, 1856, 1876-30, 1876-35, and 1899.
Information about 18xx + 18xx/PC Moderator
This German site is the homepage of the 18xx moderator program. Information about 18xx variants and other free software.
Contains information on 1835 (Germany), including a FAQ and rules for variants. Maintained by Bill Stoll. The page also hosts 1835 pbem games.
Links and information about the series.
Yahoo! Groups: 18xx
Discussion group for 18xx fans. Requires joining to post.