Treo - Treo is the page speed monitoring tool that helps your customers from obtaining a faster web experience.
BrokenLinkCheck - Free Broken Link Checker / Online Dead Link Checking Tool - find bad hyperlinks
Website Grader - Grade your website's strengths and weaknesses in seconds.
Dead Link Checker - Check for broken links on any website
Deppbot - Continuous Updates - Based on your configured schedule, deppbot will run bundle update on your Ruby app and send the result as a Pull Request to GitHub.
LinkChecker - LinkChecker is a free, GPL licensed website validator.