Serpstat - Search analytics, Rank tracking, Backlink analysis and Site Audit tool.
PublicizeTo - Single place to submit your startup to get feedback and gain customers.
Screpy - Screpy is a web analysis tool that can analyze all pages of your websites in one dashboard and monitor them with your team. It's powered by Lighthouse and it also includes some different analysis tools (SEO, SERP, W3C, Uptime, etc).
Promotehour - Free list of 1100+ media outlets to pitch your startup
SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.
Submit Juice - Free and curated list of startup directories to promote your new startup. We manually post your startup to more than 150+ relevant directories and blogs to help your startup get discovered.