Warzone 2100

The Warzone Factory
Includes maps, downloads, and cheats.
http://www.geocities.com/k_anderson15/

Warzone2100.com
Forums, screenshots, maps, walkthroughs and strategies.
http://www.strategyplanet.com/warzone2100/

Warzoner
Includes stratergy tips and rule variation ideas. Also features costing information for emplacements.
http://www.warzoner.com/