Aircall - Aircall is a call center software of a new generation designed for fast growing companies. Setup instantly and integrates to your CRMs
Listmonk - Send e-mail campaigns from a powerful dashboard. High performance and features packed into one app.
Servetel - Communication management solution
Mailman - Mailman is free software for managing electronic mail discussion and e-newsletter lists.
LeadMaster - The LeadMaster LeadMasterCRM All-in-One solution includes: marketing automation, lead management, email marketing, website integration & much more.
Sendy - Sendy is a self hosted newsletter app that sends emails 100x cheaper via Amazon SES