iThenticate - Prevent Plagiarism in Published Works

Grammarly - Clear, effective, mistake-free writing everywhere you type.

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.

LanguageTool - Free proofreading tool for OpenOffice, LibreOffice, Firefox, and Chrome.

PlagScan - The Internet makes plagiarism a bigger problem than ever.

Hunspell - Hunspell is the spell checker of LibreOffice, OpenOffice.