I am looking for a search engine spider, which would be available under GPL (ie free) which can index sites on the net into a MySQL database. I am already aware of projects such as mnogosearch, but i just need an easy to install/use spider. I just want the spider, not the full search engine software.

The spider needs to be able to index sites quite fast as i am trying to develop my own web search engine. Also needs to be quite detailed with url, title, text, indexing etc. Any information about where i can get one would be greatly appreciated.