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[Roman-Delcarmen]

Looks like free tools compilation, with many options such as

• Article Spinner
• Online Grammar Checker
• Backlink Checker
• Link Analyzer and so on...

But talking about your question the "Plagiarism Calculator Tool" looks like a basic tool which is ok
if you just want to check just a few articles per month and manage some small blog.

If you want to get seriusly or have multiples blogs with several post to publish and optimize
then this are some options

http://www.copyscape.com/
https://plagiarismcheck.org/
https://www.grammarly.com/
http://plagiarisma.net/
https://www.quetext.com/
http://www.plagium.com/

Best Regards