An easy to use, powerful crawler implemented in PHP
Internet Archive's open-source, web-scale, web crawler project
Flexible Node.js AI-assisted crawler library
Easy Spider is a distributed Perl Web Crawler Project from 2006
Multiple server/webapp vulnerability scanner
An open source search engine with RESTFul API and crawlers
a java-based crawler
Web Crawler/Spider for NodeJS + server-side jQuery
IOSec Addons are enhancements for web security and crawler detection
Modular web site spider for web developers.
Finds all the security information for a given domain name
Zoozle 2008 - 2010 Webpage, Tools and SQL Files
Open source Search Engine and Enterprise Search
Python Web Crawler Library