PUBLIC MARKS with tag webcrawler

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WebCrawler © brings users the top search results from Google, Yahoo!, Windows Live, Ask.com, About.com, MIVA, LookSmart and other popular search engines. WebCrawler provides multimedia results including images, audio, video, news, and local information. WebCrawler is a registered trademark of InfoSpace, Inc.

Crawl-By-Example project is improving crawler ability to find useful and interesting pages, a plugin to the Heritrix crawler.

a library that allows you to extract information from semi-structured documents (such as websites). Ariel will use a small number of labeled examples to generate and learn effective extraction rules.

RDig provides an HTTP crawler and content extraction utilities to help building a site search for web sites or intranets. Internally, Ferret is used for the full text indexing.

下面一个小工具专门检查robots.txt文件的有效http://www.searchengineworld.com/cgi-bin/robotcheck.cgi

webcredible.co.uk 上的这篇文章《Does a question mark in the URL affect ranking? 》。该文作者将google和yahoo对动态链接的收录等级作成了张坐标图.从表中可以看出。动态URL（带问号的）在google的优先等级非常

Heritrix is the Internet Archive's open-source, extensible, web-scale, archival-quality web crawler project