Which IS Best Tool For SEO?

As the title Show And i want to know about you people that Guide me regarding the SEO tool.
Thanks

is that necesaary to use some tools for the SEO ?......

Using SEO tools or softwares are not a good practice in SEO. I would suggest you to do SEO manually which is more effective and safe.

I would like to suggest you...seocentro.com because i also use this tool & i am satisfied with it.

Finding the best keywords, optimizing the web pages, optimizing the inbound links, submitting the website to search engines and directories are some best tips for effective SEO. Following these steps will guarantee to get a number #1 ranking in Google.