Anonymizer
www.anonymizer.com

AT&T Labs Crowds
www.research.att.com/projects/crowds

DoubleClick
www.doubleclick.com

LPWA ProxyMate
www.lpwa.com

PGP Data Security Suite
www.pgp.com/asp_set/products/tns/pgpess_intro.asp

PGPDisk
keyserver.ad.or.at/pgp/products/nai/pgpdisk

TrustE
www.truste.com

W3C P3P
www.w3.org/P3P