BrokenLinkCheck - Free Broken Link Checker / Online Dead Link Checking Tool - find bad hyperlinks
Google Structured Data Testing Tool - Google Structured Data Testing Tool
Dead Link Checker - Check for broken links on any website
Ahrefs Backlink Checker - With the world's biggest index of live backlinks (over 15 trillion), Ahrefs Backlink Checker will show you the most complete backlink profile for any website.
LinkChecker - LinkChecker is a free, GPL licensed website validator.
One Hour Indexing - One Hour Indexing is a powerful, automated service that indexes and pings your backlinks. It's 100% Google safe and gives guaranteed ranking results