how many independent search engines crawlers?

Giganews Newsgroups
Subject: how many independent search engines crawlers?
Posted by:  Orson Cart (ex-priv…@parts.org)
Date: 24 Sep 2010

I am not talking about regional search engines.
Nor specialists like Deep Dyve.
After so much takeover/mergers, we have?

Google
Microsoft/Yahoo
Ask
Gigablast (more like a database of spamdexers)

Now I tried lygo.com and found something that did not come up in
those above. So do they still run their own crawler?

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