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Their browser-based self-hosted solution has optional closed-source components, but the desktop app is pretty much open source: https://github.com/ONLYOFFICE/De
by notpushkin 3y ago
Their browser-based self-hosted solution has optional closed-source components, but the desktop app is pretty much open source: https://github.com/ONLYOFFICE/DesktopEditors https://github.com/ONLYOFFICE/DesktopEditors
The development model is a bit sketchy (e. g. they have a separate private issue tracker and sometimes ignore tickets in their open source repos), but the sources are there.