Collabora Online is a browser-based office suite in which teams edit text documents, spreadsheets, presentations and drawings together. It is built on LibreOffice and supports many file formats, including Microsoft formats and ODF. Organisations run it on their own infrastructure, scale it with Kubernetes through the COOL Controller, or use it through a hosting partner. It can be embedded in other platforms, including Nextcloud, WordPress, Moodle and SharePoint. A separate development edition, CODE, exists but is not intended for production.
Collabora Online is offered by Collabora Productivity Ltd, a company with its registered office in Cambridge, United Kingdom. The United Kingdom is outside the EU. The source code is open source (MPL-2.0 and other licences) and auditable. Because you can host it yourself, you decide where your documents are stored and who has access; with a hosting partner, the location depends on that partner. For a European organisation, it is a way to combine online document collaboration with control over its own infrastructure.