Is OnlyOffice open-source?

Posted by ecthiender@reddit | linux | View on Reddit | 65 comments

After recently seeing a lot of posts about OnlyOffice being a modern office-suite and a lot of people recommending it, I decided to check it out. I have been using LibreOffice. Although, fair disclaimer, I'm not a heavy user of office-suite programs.

So I went to their website and was curious if it was open-source. It led me to this repo https://github.com/ONLYOFFICE/DesktopEditors . If you see the components section from the github readme -

ONLYOFFICE Desktop Editors contain the following components:

Looks like this repo only contains the frontend and SDKs? The "core", IIUC, is for converting across formats. Where can I find the core source code, of the word processor or the spreadsheet program? Does anyone know? Am I missing something? Or are they closed-core model?

PS: I asked their support chat as well. They were very helpful, and eventually pointed me to this repo. And mentioned that the desktop editors are open-source. But when I asked further clarification about the missing "actual core" component. They said they are not able to provide further technical support regarding as it's not available in the free-tier. If I pay, then I can get technical support which will provide me answer to that question.