Anemone web-spider framework

MetaInspector lets you scrape a web page and get its links, images, texts, meta tags...

Generic Web crawler with a DSL that parses structured data from web pages

Modern web scraping framework written in Ruby and based on Capybara/Nokogiri

Pismo extracts and retrieves content-related metadata from HTML pages - you can use the resulting data in an organized way, such as a summary/first paragraph, body text, keywords, RSS feed URL, favicon, etc.

Ruby gem generating thumbnail images from a given URL.

Cobweb is a web crawler that can use resque to cluster crawls to quickly crawl extremely large sites which is much more performant than multi-threaded crawlers. It is also a standalone crawler that has a sophisticated statistics monitoring interface to monitor the progress of the crawls.

Download, pull out of a ZIP/TAR/GZ/BZ2 archive, parse, correct, and import XLS, ODS, XML, CSV, HTML, etc. into your ActiveRecord models. Uses Upsert internally for speed.

Maintained fork of Kimurai, a modern web scraping framework written in Ruby and based on Capybara/Nokogiri

Crawl web sites easily using ruby recipes, with caching and nokogiri.

A pure ruby implementation of the boilerpipe web content extraction algorithm

Easily fetch product information from third party websites such as Amazon, Steam, eBay, etc.

DocParser is a Ruby Gem for webscraping

A simple, fast web crawler

It's a scraper

A simple plugin for extracting information from url entered by user (Something like what facebook does). This gem is built on top of opengraph gem created by michael bleigh.

MediaWiki API and Page content parser for Headlines (nested), TextBlocks, ListItems, and Links.