Listmonk - Send e-mail campaigns from a powerful dashboard. High performance and features packed into one app.
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.
Sendy - Sendy is a self hosted newsletter app that sends emails 100x cheaper via Amazon SES
iThenticate - Prevent Plagiarism in Published Works
Mailman - Mailman is free software for managing electronic mail discussion and e-newsletter lists.
Urkund - Detect and check for plagiarism with URKUND