Welcome to WebmasterWorld Guest from 126.96.36.199
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_(email@example.com) 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.
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