Listmonk - Send e-mail campaigns from a powerful dashboard. High performance and features packed into one app.

Klaviyo - Klaviyo helps brands own the customer experience, grow higher-value relationships, and deliver more personalized marketing experiences across email, mobile, and web.

Sendy - Sendy is a self hosted newsletter app that sends emails 100x cheaper via Amazon SES

Campaign Monitor - Email marketing software built for designers and their clients to run successful email campaigns.

Mailman - Mailman is free software for managing electronic mail discussion and e-newsletter lists.

TargetBay - TargetBay is a complete eCommerce revenue generation platform.