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Thunderbird - Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!
WildApricot - WildApricot is a powerful cloud software to help you automate and simplify membership tasks.
Mailbird - Mailbird is the best email client for Windows 7, 8 and 10
Tendenci - Tendenci - The Open Source AMS is a cloud-based all-in-one management SaaS solution for Non-profits and Associations.
Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.