Thanks to Matrix Essays & its informants for these

[mcpye]

Metacortechs/Meta-cortex
This is supposedly the company that Neo works for in The Matrix.
www.metacortechs.com

Starting in late September, MetaCortechs's site became active. The WB (Watchowski Brothers) created an authentic-looking hosting company to host MetaCortechs's site, as well as several other sites that were created by MetaCortechs "employees".

free.pages.at/areku/meta/htm/introduction.htm
www.cs.uiowa.edu/~mlpatter/matrix
www.bole.ca/matrix/index.php
forums.unfiction.com/forums/index.php?c=13 (Unfiction.com’s forum for Metacortechs)

As of October 4, these are the websites that are related to this stunt:
www.underscorehosting.com (the fake company set up by the WB to host all these Matrix-stunt-related websites)
www.little-boxes.net
www.metadex.net
www.paranormaljournal.org
www.paintover.net
www.theaquapolis.com
www.sheismissing.info
www.heismissing.info
www.underscorehosting.com
www.cascadevortex.com
www.leiphe.net

Thanks to Matrix Essays for these. See posts:
Metacortechs1;
Metacortechs2;
Metacortechs3