Listmonk - Send e-mail campaigns from a powerful dashboard. High performance and features packed into one app.
PlagiarismSearch - PlagiarismSearch is online service that detects plagiarized content.
Sendy - Sendy is a self hosted newsletter app that sends emails 100x cheaper via Amazon SES
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.
Mailman - Mailman is free software for managing electronic mail discussion and e-newsletter lists.
Unicheck - The plagiarism checker Unplag scans across the internet, repositories, open sources content and databases. It delivers real-time results and has no cached data.