Ruby web crawler using PhantomJS

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

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

This is a crawler framework.

Bulbasaur is a helper for crawler operations used in Pread.ly

This gem helps Crawler Writers to interact with the PromoQui REST API

Voight-Kampff detects bots, spiders, crawlers and replicants

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

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.

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.

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

Asynchronous web crawler, scraper and file harvester

Crawl instagram photos, posts and videos for download.

JavaScript enabled web crawler kit

A client for the PageMunch web crawler API

Website crawler and fulltext indexer.

your friendly neighborhood web crawler

render_static allows you to make your single-page apps (Backbone, Angular, etc) built on Rails SEO-friendly. It works by injecting a small rack middleware that will render pages as plain html, when the requester is one of the most common crawlers/bots out there (Google, Yahoo Baidu and Bing)

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

Simple site crawler using Capybara