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Scrapy (/ ˈ s k r eɪ p aɪ / [2] SKRAY-peye) is a free and open-source web-crawling framework written in Python. Originally designed for web scraping, it can also be used to extract data using APIs or as a general-purpose web crawler. [3] It is currently maintained by Zyte (formerly Scrapinghub), a web-scraping development and services company.
Although this release includes library upgrades to Crawler Commons 0.3 and Apache Tika 1.5, it also provides over 30 bug fixes as well as 18 improvements. 2.3 2015-01-22 Nutch 2.3 release now comes packaged with a self-contained Apache Wicket-based Web Application. The SQL backend for Gora has been deprecated. [4] 1.10 2015-05-06
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.
Distributed web crawling is a distributed computing technique whereby Internet search engines employ many computers to index the Internet via web crawling.Such systems may allow for users to voluntarily offer their own computing and bandwidth resources towards crawling web pages.
Web scraping is the process of automatically mining data or collecting information from the World Wide Web. It is a field with active developments sharing a common goal with the semantic web vision, an ambitious initiative that still requires breakthroughs in text processing, semantic understanding, artificial intelligence and human-computer interactions.
Crawler-based search engines are those that use automated software agents (called crawlers) that visit a Web site, read the information on the actual site, read the site's meta tags and also follow the links that the site connects to performing indexing on all linked Web sites as well. The crawler returns all that information back to a central ...
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 ...
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 ...