Listmonk - Send e-mail campaigns from a powerful dashboard. High performance and features packed into one app.
HubSpot CRM - Free CRM software for small businesses.
Mailman - Mailman is free software for managing electronic mail discussion and e-newsletter lists.
Keap - Grow Sales. Save Time. Get Organized.
Sendy - Sendy is a self hosted newsletter app that sends emails 100x cheaper via Amazon SES
Less Annoying CRM - A simple customer relationship manager made just for small businesses. Manage contact info, track leads, and never miss a follow-up.