CrawlerDetect is a PHP class for detecting bots/crawlers/spiders
An easy to use, powerful crawler implemented in PHP
SiteOne Crawler is a website analyzer and exporter
Library for Rapid (Web) Crawler and Scraper Development
Create and generate sitemaps with ease
The complete web scraping toolkit for PHP
Distributed web crawler admin platform for spiders management
Goutte, a simple PHP Web Scraper
Multiple server/webapp vulnerability scanner
An open source search engine with RESTFul API and crawlers
File system crawler and disk space usage software
IOSec Addons are enhancements for web security and crawler detection
Enumeration and automation of file discovery for your sec tools.