Rock RMS - Rock RMS is a community supported open-source Church Management System that provides innovative features to churches of all sizes.
Thunderbird - Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!
ChurchSuite - ChurchSuite is a cloud hosted, web-based church management system, ideal church database software for churches.
Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
ChurchInsight - ChurchInsight is a church website content management system (cms). It allows churches to have great church websites and the best church website designs.
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.