SEO Tools:

#1
I have List out the SEO tools , If you needed use this website for your website Ranking on Google.

  • Duplicate Content Checker Tools
  • Copyscape
  • Article Checker
  • Plagium
  • Duplicate Content Checker
  • Virante Duplicate Content Checker
  • Dupli Checker
  • Plagiarism Checker
  • Copygator
  • Similar Page Checker
 
#3
you can small seo tool also for keywords ,page checking it is good & free tool,helpful in providing result in different search engines like Google,bing,yahoo
 
#5
I guess all these tools are to check duplicate content , some SEO tools that I know really help are the following.

1. Ahrefs
2. Majesticseo
3. SEMrush
4. Open Site Explorer
 
#14
Some good SEO tools used for website optimization are:

Google keyword planner
Google analytics tool
Google webmaster tool
Google Adwords
Ahrefs
Copyscape
Moz SEO tools