ONLYOFFICE is a free and open-source office suite that primarily focuses on providing you with a collaborative document editing platform in the cloud.
You can choose to self-host it with Nextcloud or other platforms for handling documents, or opt for the official hosted instance and resellers. There are paid plans tailored for businesses, developers, and home users.
The product offerings can be a bit confusing, but you need to spend a bit of time looking at the details to understand what you need.
If you do not need to utilize the cloud and the collaboration capabilities, you can always download the desktop edition that works offline.
Source
Website
You can choose to self-host it with Nextcloud or other platforms for handling documents, or opt for the official hosted instance and resellers. There are paid plans tailored for businesses, developers, and home users.
The product offerings can be a bit confusing, but you need to spend a bit of time looking at the details to understand what you need.
If you do not need to utilize the cloud and the collaboration capabilities, you can always download the desktop edition that works offline.
Source
Website