USA: http://www.internic.com/
Non-profit making organizations: http://rs.internic.net/rs-internic.html
Links for NIC sites for other countries: http://www.uninett.no/navn/domreg.html
Altavista: http://www.alatavista.digital.com/
HotBot: http://www.hotbot.com/
Lycos: https://www.lycos.com/
OpenText: http://www.opentext.com/
WebCrawler: http://www.webcrawler.com/
Yahoo: http://www.yahoo.com/
Search engines for software:
http://www.shareware.com/
http://www.download.com/
Site that submit URLs to search services:
http://www.submit-it.com/
http://www.powerpromote.com/
PC Magazine Online: http://www.zdnet.com/pcmag/
ZDNet Mac: http://www.zdnet.com/mac/
C/Net: http://www.cnet.com/