According to their website, Collabora Online:
is a powerful online document editing suite which you can integrate into your own infrastructure or access via one of our trusted hosting partners. Data protection is our priority. We provide you with the tools needed to keep your work secure, GDPR-compliant, without compromising on features.
We use them to selfhost a document service to integrate with Nextcloud, but you can also use Collabora Online directly.
- externals secret for admin credentials
- collabora web app