Google Page Speed Insights:Check the speed and usability of your site on multiple devices.
Google Analytics:Google Analytics provides detailed reports in real time on who visits your site, when they visit, where they visit from geographically and on what pages
Google Webmaster:Google Webmaster Tools provide a full list of the search phrases that result in your web site being displayed on the search Engine Result Pages. You will also receive full information about all internal and external links to your website, keywords, errors and missing pages. Such information is of utter importance when you want to better optimize your website and have it displayed higher in the search engine results.
Small SEO Tool:This tool contains all tools.you can check keywords ranking,domains authority etc.
keyword Planner:The Keyword Planner is a part of the Google Adwords advertising platform. It allows users to research and analyze lists of keywords for use in pay-per-click campaigns. The keyword planner is designed as a paid search tool but its data is nonetheless extremely useful for SEOs.