Freeciv

Apolyton.net FreeCiv Forum - http://apolyton.net/forums/forumdisplay.php?forumid=111
Discussion forum.

Civ - http://www.civ.alkar.net/
Offers game manuals, an FAQ, online gameplay information, and downloads.

FreeCiv 1.5 Information - http://www.upl.cs.wisc.edu/~orn/freecivinfo.html
Documention by Rudy Moore designed to fill the gaps in the official online documentation.

FreeCiv OpenVMS Port - http://www.ourservers.net/openvms_ports/freeciv/freeciv_contents.html
Information on compiling and running on OpenVMS.

Freeciv Stuff - http://www.math.ttu.edu/~kesinger/freeciv/
Patches, game logs, and scripts.

FreeCiv Tools & Toys - http://www.cs.utexas.edu/users/bdbryant/freeciv/
Offers modifications, screenshots, and tilesets.

FreeCivilopedia - http://home.arcor.de/chr.schweer/Sonstiges/FreeCivilopedia/
An encyclopedia of units, city improvements, and wonders found in FreeCiv.

The Freeciv Game User's Guide - http://tecfa.unige.ch/guides/games/freeciv/manual/game.html
A guide on the game's concepts and elements.

Zaurus Freeciv - http://www.robfisher.net/zaurus/freeciv.html
A port for the PDA. Has screenshots, news, and download.