Dr. Link Check - Broken link checker with malware and parked domain detection
PostgreSQL - PostgreSQL is a powerful, open source object-relational database system.
BrokenLinkCheck - Free Broken Link Checker / Online Dead Link Checking Tool - find bad hyperlinks
MySQL - The world's most popular open source database
LinkChecker - LinkChecker is a free, GPL licensed website validator.
Microsoft SQL - Microsoft SQL is a best in class relational database management software that facilitates the database server to provide you a primary function to store and retrieve data.