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.
Moz - Backed by industry-leading data and the largest community of SEOs on the planet, Moz builds tools that make inbound marketing easy.
Turnitin - Turnitin is preferred by educational institutions around the world for preventing plagiarism. Instructors at all levels of education can request that students use the service to submit papers, and Turnitin checks those papers for plagiarism.
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!
iThenticate - Prevent Plagiarism in Published Works
SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.
Urkund - Detect and check for plagiarism with URKUND