Postman - The Collaboration Platform for API Development
Dead Link Checker - Check for broken links on any website
Insomnia REST - The most intuitive cross-platform REST API Client ð´
BrokenLinkCheck - Free Broken Link Checker / Online Dead Link Checking Tool - find bad hyperlinks
Assertible - Assertible software provides you with a simple and quick way to monitor your web services. It comes with automated QA tools that users can utilize to test and monitor their web services on different platforms and environments.
LinkChecker - LinkChecker is a free, GPL licensed website validator.