Listmonk - Send e-mail campaigns from a powerful dashboard. High performance and features packed into one app.
NeverBounce - Real-time email verification and cleaning to ensure emails never bounce.
Mailman - Mailman is free software for managing electronic mail discussion and e-newsletter lists.
Email List Verify - The Fastest Way to Improve Email List Deliverability and ROI
Sendy - Sendy is a self hosted newsletter app that sends emails 100x cheaper via Amazon SES
DeBounce - Email Validation, Email Checker, Data Enrichment and Appending Tool. Using DeBounce remove invalid, disposable, spam-trap, syntax and deactivated emails.