Microsoft Office Excel - Microsoft Office Excel is a commercial spreadsheet application.
Beeceptor - Unblock yourself from API dependencies, and build & integrate with APIs fast. Beeceptor helps you build a mock Rest API in a few seconds.
Google Sheets - Synchronizing, online-based word processor, part of Google Drive.
WireMock - WireMock - a web service test double for all occasions.
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.
Mockoon - Mock servers in seconds