The Baidu Crawler is to crawl data with your demmand

A simple web crawler gem

Retrieves a list of URLs to seed the crawler by publishing them to a RabbitMQ exchange.

a simple web crawler using DSL of capybara

A simple web crawler gem

it starts a crawler for Middleman sites

Web crawler to get courses from XML pages at mymav.uta

A flexible, modular web crawler

Generic Web crawler with a DSL that parses event-related data from web pages

Easy way to enable AdSense crawler to login and see private or custom pages in your rails application. Basically one custom login filter. Gem enables you to easily slightly increase revenues from Google AdSense/AdWords. It makes it easy to enable crawling on private pages and so get better target...

Crawl instagram photos, posts and videos for download.

Asynchronous web crawler, scraper and file harvester

An easy to use distributed web-crawler framework based on Redis

Arachnid is a web crawler that relies on Bloom Filters to efficiently store visited urls and Typhoeus to avoid the overhead of Mechanize when crawling every page on a domain.

Post URLs to Wayback Machine (Internet Archive), using a crawler, from Sitemap(s) or a list of URLs.

Rack Middleware adhering to the Google Ajax Crawling Scheme, using a headless browser to render JS heavy pages and serve a dom snapshot of the rendered state to a requesting search engine.

validate-website is a web crawler for checking the markup validity with XML Schema / DTD and not found urls.

Ruby web crawler using PhantomJS

Cosmicrawler is crawler library for Ruby. It provides scalable asynchronous crawling by (http|file|etc) using EventMachine.

A web scrawler to get a Marmiton's recipe