I use

Alexa
RankSignal
Only Wire
Google Webmaster
Google Analytics

Mostly Used tools are:

Webmaster
Analytic
keyword Planner
iwebcheck

I use Keyword planner for keyword suggestion and Google webmaster..

There are a wide variety of tools you need to use for SEO:
- Google Webmaster tools
- Google Analytics
- Google Keyword Planner
- Google Trends
- MOZ
- MajesticSEO

I use Ahref, Google Analytics and Webmaster tools. Among them, Ahref is the best :)

We use Backlinkswatch.com which is free.

Good Luck

I use the following seo tools which are as follows:
1.google webmaster
2.Google Analtics.
3.website analyszer.
4.site exlorer.
5.Adwords google for keyword research.
6.pingomatic

I used free SEO tools provided by Google, easy to use & get results.

never miss google webmaster tools

SEO tools

woorank
smallseotools
seositecheckup
google webmaster tools
backlinkwatch
bing webmaster tools

Rifle Range
 

On page and Off Page.

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People used SEO tools in old days for auto submission as well. MOZ, ahref, raven, market samurai, web ceo etc have good reputation in these days.

Long Tail Pro v3.0
Google research keyword
Google analytics
Google webmaster tools
SEO Moz tool
Ahrefs

I use smallseotools.com for easy and fast moving...

Google research keyword
Google analytics
Google webmaster tools