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.
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.
Moz - Backed by industry-leading data and the largest community of SEOs on the planet, Moz builds tools that make inbound marketing easy.
SEO Crawler - A web-based crawler with real-time crawl feedback.
Serpstat - Search analytics, Rank tracking, Backlink analysis and Site Audit tool.