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StormCrawler is modular and consists of a core module, which provides the basic building blocks of a web crawler such as fetching, parsing, URL filtering. Apart from the core components, the project also provides external resources, like for instance spout and bolts for Elasticsearch and Apache Solr or a ParserBolt which uses Apache Tika to ...
Nutch is coded entirely in the Java programming language, but data is written in language-independent formats. It has a highly modular architecture, allowing developers to create plug-ins for media-type parsing, data retrieval, querying and clustering. The fetcher ("robot" or "web crawler") has been written from scratch specifically for this ...
It was written in Java. ht://Dig includes a Web crawler in its indexing engine. HTTrack uses a Web crawler to create a mirror of a web site for off-line viewing. It is written in C and released under the GPL. Norconex Web Crawler is a highly extensible Web Crawler written in Java and released under an Apache License.
Heritrix is a web crawler designed for web archiving.It was written by the Internet Archive.It is available under a free software license and written in Java.The main interface is accessible using a web browser, and there is a command-line tool that can optionally be used to initiate crawls.
HTTrack is a free and open-source Web crawler and offline browser, developed by Xavier Roche and licensed under the GNU General Public License Version 3. HTTrack allows users to download World Wide Web sites from the Internet to a local computer. [5] [6] By default, HTTrack arranges the downloaded site by the original site's relative link ...
As the crawler visits each of those pages, it will inform the frontier with the response of each page. The crawler will also update the crawler frontier with any new hyperlinks contained in those pages it has visited. These hyperlinks are added to the frontier and the crawler will visit new web pages based on the policies of the frontier. [2]