SEO Tools Centre provides SEO checker services for websites. Here you will find different types of free SEO tools: plagiarism checker, broken links analyzer and much more for free.
Editsaurus - Highlights potential pitfalls in your writing to encourage good habits.
Moz - Backed by industry-leading data and the largest community of SEOs on the planet, Moz builds tools that make inbound marketing easy.
Grammarian PRO3 - Grammarian PRO3 is a feature-rich grammar checker that enables you to write better content without taking assistance from the English teacher.
SEO PowerSuite - Get all SEO tools in one pack - download free edition of SEO PowerSuite and get top 10 rankings for your site on Google and other search engines!
LanguageTool - Free proofreading tool for OpenOffice, LibreOffice, Firefox, and Chrome.
SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.