SEO Analyzer By Neil Patel - A free SEO analyzer for your site
WebGazer - Monitor your website's availability with WebGazer, review its performance and get instant notifications when your website goes down. No installation required and free plan available.
Serpstat Website SEO Checker - Check your website's SEO, analyze competitors and keywords
Oh Dear! - Website monitoring, without the hassle
Serpstat - Search analytics, Rank tracking, Backlink analysis and Site Audit tool.
Freshworks - Delight your customers, from wherever you are