Bloomerang - Bloomerang is a simple donor database and fundraising software solution that helps nonprofits decrease donor attrition and increase revenue.
Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
Kindful - Nonprofit donor database + fundraising tools all in one
Mailbird - Mailbird is the best email client for Windows 7, 8 and 10
Classy - Expressive, flexible, and powerful stylesheets for native iOS apps
eM Client - eM Client is a fully-featured email client for Windows and macOS with a clean and easy-to-use interface. eM Client also offers features for calendars, tasks, contacts, notes, and chat.