Compared with ALL older versions of software especially both Linux Office tells you what to do instead of performing what you ask for step by step. I often cannot find the way to repair what I did where in Windows this goes fine or is easy to correct. Beside that Open Office is very slow compared with Libre Office and Microsoft is still the fastest.
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.
Webhook.site - Instantly generate a free, unique URL and email address to test, inspect, and automate (with a visual workflow editor and scripts) incoming HTTP requests and emails.
LibreOffice - Calc - LibreOffice Calc is the spreadsheet program you've always needed. A fork of OpenOffice.
MockServer - Easy mocking of any system you integrate with via HTTP or HTTPS.