Below are major robots search engines. They account for over 95% of total search engine market share. Make sure to submit your sites to these search engines.
Aeiwi
Alexa
AltaVista
AOL Netfind
Anzwers
Canada.com
Direct Hit
EuroSeek
Excite
Find What
Google
HotBot
ICQ It
I Won
InfoMak
InfoSeek
Lycos
MSN Search
Northern Light
NBCi
Surf Gopher
Thunderstone
UKMax
WebCrawler
World Search Center
What-U-Seek