Listmonk - Send e-mail campaigns from a powerful dashboard. High performance and features packed into one app.
Prezi - Welcome to Prezi, the presentation software that uses motion, zoom, and spatial relationships to bring your ideas to life and make you a great presenter.
Sendy - Sendy is a self hosted newsletter app that sends emails 100x cheaper via Amazon SES
Google Slides - Create a new presentation and edit it with others at the same time — from your computer, phone or tablet. Free with a Google account.
Mailman - Mailman is free software for managing electronic mail discussion and e-newsletter lists.
Keynote - Keynote for Mac, iOS, and iCloud lets you make dazzling presentations. Anyone can collaborate — even on a PC. And it’s compatible with Apple Pencil.