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Microsoft Office Excel - Microsoft Office Excel is a commercial spreadsheet application.
Thunderbird - Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!
Google Sheets - Synchronizing, online-based word processor, part of Google Drive.
Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
Apple Numbers - Numbers lets you build beautiful spreadsheets on a Mac, iPad, or iPhone — or on a PC using iWork for iCloud. And it’s compatible with Apple Pencil.
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.