Lecturio - Medical course and video lecture delivery platform
Listmonk - Send e-mail campaigns from a powerful dashboard. High performance and features packed into one app.
KenHub - Use Kenhub to learn anatomy
Sendy - Sendy is a self hosted newsletter app that sends emails 100x cheaper via Amazon SES
USMLE-Rx - The app created by First Aid authors
Mailman - Mailman is free software for managing electronic mail discussion and e-newsletter lists.