OpenGrok - OpenGrok is a fast and usable source code search and cross reference engine.
BrokenLinkCheck - Free Broken Link Checker / Online Dead Link Checking Tool - find bad hyperlinks
GrepCode - GrepCode.com is a code search engine built by developers for developers to search and browse open...
Dead Link Checker - Check for broken links on any website
Krugle - Krugle is the complete enterprise solution for search targeted to the development organization.
LinkChecker - LinkChecker is a free, GPL licensed website validator.