AlternativeTo - AlternativeTo lets you find apps and software for Windows, Mac, Linux, iPhone, iPad, Android, Android Tablets, Web Apps, Online, Windows Tablets and more by recommending alternatives to apps you already know.
Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
BlackBerry Hub - Download a free trial of BlackBerry Hub+ apps for Android phones running Lollipop 5.0 or higher. Boost productivity with BlackBerry Hub+ Inbox, Calendar, Launcher and more.
Mailbird - Mailbird is the best email client for Windows 7, 8 and 10
Maqtoob - Discover business tools
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.