Distributed Web Crawlers

Pholcus is a distributed web crawler framework written in Go designed for high-concurrency data extraction. It functions as a distributed crawling orchestrator and dynamic data extraction engine, utilizing a server-client architecture to coordinate tasks across multiple nodes. The system integrates a headless browser engine to render dynamic content and execute JavaScript, allowing it to extract data from single-page applications. It features a web-based management interface for configuring spider parameters and monitoring execution progress, alongside the ability to update extraction rules v

This project is a distributed headless Chrome web crawler and data extraction framework. It functions as a JavaScript rendering engine that uses a headless browser to process dynamic pages, extracting structured data from websites that require JavaScript execution. The system is designed for scalable data collection across multiple nodes, using distributed task synchronization and shared caches to prevent duplicate work. It distinguishes itself through the ability to emulate specific client environments by configuring user agents and viewport dimensions, while capturing visual evidence such a

Crawlab is a distributed web scraping platform designed to centralize the management, deployment, and execution of large-scale data extraction tasks. It functions as a control plane that orchestrates scraping scripts and automated workflows across multiple nodes, providing a unified environment for managing complex data collection operations. The platform distinguishes itself through a distributed architecture that coordinates worker nodes via a central master, utilizing real-time communication to maintain oversight of all active processes. It ensures operational consistency by isolating task

PySpider is a Python web crawling framework designed for automated data extraction. It provides a pipeline for periodically fetching web content, processing HTML, and persisting scraped information into database backends. The system features a web-based management interface for editing scraping scripts, monitoring task progress, and reviewing collected data. It includes a headless browser JavaScript renderer to capture rendered HTML from dynamic web pages and a distributed architecture that uses message queues to scale crawling workloads across multiple nodes. The framework also covers task

Pholcus is a distributed web crawling system designed for large-scale data scraping. It employs a master-worker distribution model to coordinate high-concurrency scraping tasks across a network of remote client nodes, enabling both horizontal and vertical data collection. The system features a hot-loadable rule engine that allows extraction and navigation logic to be updated at runtime without restarting the process. It handles dynamic content through headless browser integration and bypasses bot detection using proxy rotation, automated user authentication, and simulated human behavior. The

Crawl4AI is an AI-powered web crawling and data extraction engine designed to transform complex web content into structured formats. It functions as a headless browser orchestrator, enabling the navigation of dynamic websites, the execution of custom scripts, and the capture of visual assets like screenshots and PDFs. By integrating language models directly into the extraction workflow, the system converts raw HTML into clean, structured data or Markdown files optimized for downstream ingestion. The platform distinguishes itself through a distributed, self-hosted infrastructure that manages l

Scrapy-Redis is a library that transforms Scrapy into a distributed web crawling framework by replacing its in-memory scheduler with a Redis-backed component. This allows multiple Scrapy spider workers to coordinate through a shared request queue, enabling them to consume URLs concurrently while a Redis set tracks seen URLs across all workers to prevent duplicate crawls. The system persists crawl state—including pending requests and already-crawled URLs—in Redis, so a paused or crashed spider can resume from where it left off without losing progress. The library provides a Redis-based duplica

Colly is a web scraping framework and concurrent crawler written in Go. It provides a system for traversing web pages, following links, and extracting structured data from HTML and XML documents. The framework includes a distributed scraping engine designed to spread data collection tasks across multiple instances to increase throughput. It ensures compliance with website owner policies by automatically reading and respecting robots.txt files. The system manages request lifecycles through domain-based rate limiting, concurrency controls, and session management via a stateful cookie jar. It s

Distribute crawler is a distributed web scraping framework that integrates with Scrapy to coordinate multiple crawler instances across clusters. It utilizes a centralized task queue to manage and scale concurrent data collection operations, enabling horizontal scaling of scraping tasks across multiple worker nodes. The framework distinguishes itself through its focus on large-scale data management and traffic control. It persists scraped items and binary assets into document-oriented database clusters, utilizing deduplication logic to optimize bandwidth and storage. To maintain consistent dat

This project is a distributed web crawling framework that enables the horizontal scaling of scraping tasks. It uses Redis as a centralized request queue manager and state store to coordinate crawl progress and request metadata across multiple server instances. The system distributes crawling workloads by sharing a single request queue and utilizes a distributed duplicate filter to prevent multiple workers from visiting the same page. It persists complex request state and metadata as JSON strings within the shared remote store. The framework also provides capabilities for distributed data pro

Firecrawl is a web data extraction platform designed to convert unstructured web content into clean, LLM-ready formats like markdown or JSON. It functions as an autonomous web crawler and scraper, capable of mapping entire domains, performing recursive navigation, and executing complex data gathering tasks. By leveraging headless browser orchestration, the system handles dynamic, JavaScript-heavy pages to ensure comprehensive data capture. The platform distinguishes itself through its focus on agentic workflows, providing a programmatic interface that allows autonomous agents to perform live

Colly is a high-performance web scraping framework designed for the automated extraction of structured data from websites. It provides a programmable toolkit that manages the complexities of large-scale data collection, including concurrent request orchestration, automatic cookie handling, and robots.txt compliance. By utilizing an asynchronous execution model, the engine maintains high throughput while preventing resource exhaustion during recursive or distributed crawling tasks. The framework is distinguished by its modular, event-driven architecture, which allows developers to hook into sp