The French are taking digital sovereignty really seriously.
They've made huge progress with their own digital collaboration suite in the last year, so they can strip out Office365 and Google Workspace:
lasuite.numerique.gouv.fr
Email, chat, docs, sheets and even video meetings!
Une suite cohérente d'outils open source, sécurisés et simples d'utilisation, conçus pour aider les agents publics à créer, organiser, décider et collaborer en toute confiance.
