Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
Agilon One - Agilon One is a Nonprofit CRM software solution that connects and gathers information on constituents.
Mailbird - Mailbird is the best email client for Windows 7, 8 and 10
Little Green Light - Illuminating Data. Advancing Nonprofits.
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.
Donorhut - Donorhut offers cloud fundraising software for charities and non-profits of any size.