ProtonMail - Secure email with absolutely no compromises. Get your free encrypted email account today.
Microsoft Office Excel - Microsoft Office Excel is a commercial spreadsheet application.
Tauria - True end-2-end encrypted group calls for up to 50 people
Google Sheets - Synchronizing, online-based word processor, part of Google Drive.
PortaCrypt - Create portable encrypted documents on your Mac
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.