Turnitin. https://www.turnitin.com/
Empower students to do their best original work,uphold academic integrity and address even the most sophisticated potential misconduct in research work.

https://www.zotero.org. Zotero is a free,easy-to-use tool that  help researchers to collect,organize, annotate,cite,and share research.

 Scite– Citation Statement Search.
Scite helps you see whether publications, research results, and claims have been supported, contrasted, or mentioned by other researchers. Scite is a Brooklyn-based startup that helps researchers better discover and evaluate scientific articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. Scite is used by researchers from dozens of countries and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.

Google Scholar:
Google Scholar is a freely accessible web search engine that indexes the full text or metadata of scholarly literature across an array of publishing formats