European DOCUMENT COLLABORATION Alternatives

Collaborative workspace for teams to create, organise, and share documents, knowledge, and project information.

Nextcloud Office is an integrated office suite (powered by the EuroOffice project) for collaborative editing of documents, spreadsheets, presentations, and PDFs within Nextcloud.

XWiki is a French open-source knowledge sharing platform (founded 2004) for building wikis, documentation, and collaborative intranet sites.

Open-source, end-to-end encrypted collaboration suite for documents, spreadsheets, presentations, forms, and file storage.

Collabora Online is a web-based office suite for collaborative document editing.