Civilization - Call to Power

Civ Land
Collection of maps and other files.
http://members.tripod.com/madaadam2/

John Bytheway's Stuff
Mars scenario and several guidelines about scenario designing.
http://www.geocities.com/jbtwuk/

Keygen's Call to Power Site
Repository for a PBEM modification file.
http://www.geocities.com/costas_ctp/

Loki - Call to Power
Official website of the Linux port. Offers an overview, screenshots, tips and downloadable demo, extra map and updates for the game.
http://www.lokigames.com/products/civctp/

Sniper's CtP Site
Lists about the different game concepts and a good screenshot collection.
http://www.fortunecity.com/underworld/handheld/21/index.html