Answer The public

For content marketing and finding long-tail keywords

Ubersuggest 

Keywords research, traffic analysis, website audit, rank tracking

Grammarly 

Automated Grammar Checker, Plagiarism Detection

PageSpeed Insights

Make your web pages fast on all devices

Google Trends

Google Trends is trends search feature that shows the popularity of a search term in Google

XML- Sitemaps.Com

For XML sitemap generator

SEO Site checkup 

Free tool for website audit

BuzzSumo 

Content Research

Google Search Console 

Help you measure your site's search traffic and performance, fix issues and Getting your site into Google search results