Sid Meier's Alpha Centauri Game Guide

Designer diary, strategies, and discussion on best units.
http://www.gamespot.com/features/alpha/

Alpha Centauri Area

Downloads, scenarios and FAQ.
http://www.geocities.com/yang_damian/alphafan.html

The Arrival

News, game information, fan fiction, downloads, news, multiplayer ads, tips, cheats, message board, and a chat room.
http://ac.strategy-gaming.com/

Apolyton CS - Sid Meier's Alpha Centauri

Game encyclopedia, strategies, interviews, downloads, chat rooms and transcripts, fan fiction, hall of fame, and message boards.
http://apolyton.net/smac/

Xenofungus

A collection of strategic scenarios and a "Deep Space Nine" modification pack.
http://home.t-online.de/home/blue.xevious/index.html

Loki: Sid Meier's Alpha Centauri

Basic information on the Linux port, from the now-defunct Loki Games.
http://www.lokigames.com/products/smac/

The Complete Alpha Centauri Quotebook

Compilation of the quotes used in gameplay.
http://www.generationterrorists.com/quotes/smac.html

SMAC/X Active Players

A database of Alpha Centauri and Alien Crossfire Players oriented towards finding other players, technology trees, strategies and pictures.
http://www.angelfire.com/games3/AlphaCentauri/

Alpha Centauri Heaven

Reviews, resources, and information on the various factions.
http://members.tripod.com/ACHeaven/

Game Revolution: Alpha Centauri Cheats and Hints

List of possible cheats.
http://www.game-revolution.com/games/codes/pc/alpha_centauri.htm

Planet ACOL

Offers a discussion forum and rules.
http://www.planetacol.com/

GameSpot

Includes review, news, downloads, screen shots, cheats, and FAQs.
http://www.gamespot.com/pc/strategy/sidmeiersalphacentauri/