I have collected six of them, with which you can master the art of SEO and make your site a successful one.
1. Google and Bing:
The Google and Bing are search engines where the functionality works best for mastering the art of SEO. The Google-fu and Bing-fu, are equally good in examining the indexation process and in duplicating content. It also checks the keyword rankings, finds out the content scrapers, analyzes the SERP listings, and outreaches the link prospects.
2. Google Search Console
Google Search Console , formerly known as "Google Webmaster Tools"provides you with data and configuration control for your sites in Google.
3. Google Analytics
Till date, Google Analytics is the most valuable and popular SEO data tool that maintains the record of visitors and their interactions and activities with your site.
SERP_Overlay Moz is a user-friendly suite of inbound marketing tools like:
Followerwonk: This shows data on Twitter.
Moz Local: Shows the state of a company's local citations and the first start of the local SEO on a site.
The SERP Overlay: It is a part of the Mozbar displaying the OSE metrics on individual search results.
5. Google Keyword Planner
Google's Keyword Planner formerly known as Adwords Keyword Tool, pulls up the monthly Google search queries estimating the volume for dozens of keywords in seconds.
6. Screaming Frog
Screaming Frog is actually a website crawler that is particularly designed for SEO. Within mere minutes, they collect the critical data on every URL. The best way to use it is downloading and start using it for a spin.