Delta World

Includes new power packages, characters, and bargainer items.
http://cdekalb.tripod.com/

Steve Crow's Brave New World

Features an FAQ and a bibliography. Also includes new characters, powers, tricks, and quirks.
http://www.geocities.com/Area51/Stargate/4991/bnw_home.htm

Brave New World

Features new archetypes, tricks, and missions.
http://www.geocities.com/encaf1/bnw/index.html

The Caiman City Project

Joint campaign setting that includes characters, locations, a map, and adventure hooks.
http://www.golconda.de/bnw