The tools which are used for SCO are the followign :-
Google keyword planner, Google analytics tool, Google webmaster tool, Google Adwords, Ahrefs, Copyscape, Moz SEO tools.
Present time many free and paid tools are available for seo -
I'm suggesting some tools may be it also useful for you.
1. MOZ OSE - I'm using it for my website audit, measure domain DA & PA etc.
2. Google Keyword Planner - for getting best keyword ideas.
3. Google Analytics - for tracking website traffic and performance.
4. Google Webmaster - for knowing crawl status, search status & more
5. Spyfu - FOr competition checker & site audit
SEO tools which I use are Google Analytics, Google Webmaster tool, Google Keyword Planner, Small SEO tools, Backlink watch, Copyscape, SEO Site Checkup etc.