Welcome to WebmasterWorld Guest from 184.108.40.206
You'll find a lot (not all) of your answers there. Others are personal bots or the module bots for scripting language utilities. A couple you have there are new and you are going to have to do some digging to get the scoop on. A couple of them are site rippers designed to steal content or emails.
xyro_(firstname.lastname@example.org) has ben catching my eye lately - they seem to be crawling inktomi results You could read about them here [inria.fr] . I'm not sure if anything is going to come from all their crawling.
Oh, btw I still do not know what zzZ is.
northern light Gulliver/1.3
a personal bot: LEIA/2.90
nobody using perl: libwww-perl
email raider: EmailSiphon
altavista/digital research spider: Mercator-1.0
Web page info extraction software
Taiwan search engine
Internet keywords company
Excalibur Internet Spider V6.5.4
Excalibur Internet Spider (Spider for hire)
Edited by: webguy