Netpeak Spider - A desktop tool for fast and comprehensive technical audit of the entire website.
SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.
Screaming Frog SEO Spider - The Screaming Frog SEO Spider is a small desktop program (PC or Mac) which crawls websites’ links...
Lumar - (Previously DeepCrawl) Hosted SEO spider to analyze and find problems with websites.
WebsiteChecker - Sends you alerts when your website goes down.
Website Checker Tech - WebsiteChecker.Tech is SaaS tool that detects SEO and availability issues of your website, making it easier for you to fix them.