Keyword planner,Google webmaster and Google adwords.
There are different SEO tools are available for different purpose, so if you post for what purpose you are looking for an SEO tool will help us to suggest those tools.
These are some best SEO tools are as:
• Google’s keyword Planner
• Google's webmaster tool
• Google Analytics
• Google adword
• Screaming Frog
• SEMRush
• Google Trends
• Keywordtool.io
• Bing Webmaster Tools
• Moz
Google webmaster tool
Google analytics
Google adwords
Smallseotools
Google keyword planner
There are Various SEO tool that are used to optimize your websites
Google webmaster tool
Google analytics
Google adwords
SEO Major Tools are:
Google Adwords
Google Keyword Planner
Google Analytics
Google Webmasters
I have use daily this tool:
Webmaster tool
Google Analytic
Gtmetrix Tool
Keyword Planner
Google adword
Raven tools