In my knowledge Anti-Plagiarism (Check on plagiarism) software is a best option.
https://sourceforge.net/projects/antiplagiarismc/
I hope, this article will helpful to avoid plagiarism.
Article Simple steps to avoid plagiarism and improve scientific writing
https://sourceforge.net/directory/os:mac/?q=plagiarism+checker+mac+free
http://terranovuslabs.com/novusscan/
these links might help you...
www.quetext.com
www.en.writecheck.com/ways-to-avoid-plagiarism
www.turnitin.com
www.ithenticate.com
www.scanmyessay.com
http://www.checktext.org/
https://www.plagscan.com/
https://www.grammarly.com/plagiarism?q=plagiarism&gclid=COvt2O6i6rMCFQYb6wodJCUA9w
www.crossref.org
www.plagiarismsoftware.net
https://elearningindustry.com/top-10-free-plagiarism-detection-tools-for-teachers
https://www.grammarly.com/1?utm_term=smallseotools&q=grammar&utm_medium=cpc&utm_source=placement&utm_content=sst_Popup2
Since there is no guarantee that the original content of your manuscript might not be copied and sold to others before it is published by you, I discourage using any free-software-checkers for plagiarism; some of them are betrayers. On the other hand, I don't believe that there is a completely free one!
In any way, if you are insisting to use anti-plagiarism software, offline checker programs are better than online ones. If I were you, I prefer to use my own words instead.
Anyhow, you can see the following site:
https://keywordspace.com/offline/offline-checker-program/
Moreover, there is a related discussion thread on this portal:
https://www.researchgate.net/post/Are_free-software-checkers_for_plagiarism_trustable_and_faithful
I prefer to:
1- use your own words re-phrasing.
2- Use small sentences and cite the source you use directly.
3- Then the use of offline checker programs are better than online ones.
Ithenticate.com is not free ! it cost 100 dollars for on manuscript.
too expensive
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- Science topic