The open-source community has produced a version of LibreOffice (a fork of OpenOffice).
The base software (Office 2013) introduced several features that were modern at its launch: microsoft office professional plus 2013 portable 2021
The "2021" label in these downloads often refers to when the unofficial package was created or updated with third-party patches, rather than an official release. Critical Risks of Using Portable/Unsupported Office End of support for Office 2013 - Microsoft Support The open-source community has produced a version of