Panzer's DC

Features character career rules for military reservists.
http://www.fortunecity.com/underworld/myst/564/pdc.html

speedbump920's Dark Conspiracy Page

Features new monsters, careers, equipment, and house rules.
http://members.tripod.com/~speedbump920/index

Carolina Triad Sanctuary

Features Torg-to-Dark-Conspiracy conversions.
http://users.vnet.net/seawolf/dc/dc.htm

The Dimensionally Mistaken

Game fiction and adventure summaries.
http://www.megabaud.fi/~julku/

Mike Marchi's Dark Conspiracy

Campaign summaries.
http://www.42north.org/mjm/rpg/dc/

WebRing: darkcon

Group of interlinked sites also known as the "Dark Conspiracy WebRing".
http://www.webring.com/hub?ring=darkcon