Netpeak Spider - A desktop tool for fast and comprehensive technical audit of the entire website.
Free SEO Checker by Spotibo - An SEO checker that analyses based on Google's algorithm 👀
Checkbot - Checkbot will boost the SEO, speed and security of your site by checking you're following 50+ web best practices. Browser extension with free and paid plans.
SE Ranking - All-in-One cloud-based SEO software for agencies, marketing teams and webmasters
SEO Crawler - A web-based crawler with real-time crawl feedback.
SEO Minion - Chrome extension & Firefox add-on to help you with SEO