Listmonk - Send e-mail campaigns from a powerful dashboard. High performance and features packed into one app.
Bloomerang - Bloomerang is a simple donor database and fundraising software solution that helps nonprofits decrease donor attrition and increase revenue.
Sendy - Sendy is a self hosted newsletter app that sends emails 100x cheaper via Amazon SES
Kindful - Nonprofit donor database + fundraising tools all in one
Hiver - Manage Customer Support, Sales and Projects right from your Gmail inbox. Collaborate with Shared Labels, Shared Contacts, email notes, email reminders and email templates
Classy - Expressive, flexible, and powerful stylesheets for native iOS apps