Звичайно, LibreOffice чудовий.

CryptPad is a collaboration suite that is end-to-end encrypted and open-source. It is designed to facilitate collaboration by synchronizing changes to documents in real time. Since all the user data is encrypted, in the event of a breach, attackers have no way of accessing the stored content. Furthermore, if the administrators do not modify the code, they and the service also cannot access any information about the users' content.

Create and edit Word, Excel, PowerPoint, and PDF files seamlessly and easily with Writer, Spreadsheet, Presentation, and the PDF toolkit. WPS Office is a free alternative to Microsoft Office that enhances your productivity.