Doi web crawlers unnecessary, which consume resources on the web server.
1. Agent: Yanga WorldSearch Bot v1.1/beta (http://www.yanga.co.uk/)
2. Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; FunWebProducts; .NET CLR 1.0.3705; .NET CLR 2.0.50727; MSIECrawler)
1. Yanga Worldsearch Bot - I have more wrote something very brief about him. It is a bot that takes information from the indexed pages to a new search engine: yanga.co.uk. From the beginning I had doubts about this search engine. The search examples offered by this SE are dedicated to those looking for adult materials: (at least that's what it looks like)

Yanga cica belongs to a group from USA and UK, but it seems that the domain is registered and hosted in Russia. Famous for its rich crop of hacking per square pixel. I don't think it would be a tragedy for anyone if this IP class were banned on a web server. ~ 20,000 hits are felt.
internet: 91.205.124.0 – 91.205.127.255
netname: GIGABASE-NET
descr: Gigabase Ltd
country: RU
2. FunWebProducts - I saw that he is a "faithful reader" of the blogs and sites on the server. It is approaching the number of hits made by Yanga. I found only words of praise about this FunWebProducts.