Attached herewith the list of Top or Best Plagiarism software or checker or detectors having free of cost access. Also I have added list of Paid access.
01. Dupli Checker
02. Copyleaks
03. PaperRater
04. Plagiarisma
05. Plagiarism Checker
06. Plagium
07. PlagScan
08. PlagTracker
09. Quetext
10. Viper
11. Grammarly’s
12. Small Seo Tools
13. Edubirdie
14. Dustball
15. DMCA
16. Unicheck
17. WebConf's similar page checker
List of top best paid plagiarism checker tools:
01. Turnitin
02. Whitesmoke
03. ProWritingAid
If you want in depth details of above software, Kindly visit my answer mentioned in below link: