Home page for the entire suite (in French) with some screenshots: https://lasuite.numerique.gouv.fr/
Code bases are on GitHub and they use English there: https://github.com/suitenumerique/
Dev handbook (in English): https://suitenumerique.gitbook.io/handbook
Not French and I can't say I personally tried deploying any of them, but I've been admiring their efforts from afar for a while now.
Grist https://www.getgrist.com/
A write-up of how the French gov uses it https://interoperable-europe.ec.europa.eu/collection/open-so...
That being said, I should ask: to what extent do you see being US-based an advantage or a problem in the current state of things? For example, in regards to exports controls, or any other such thing that may potentially limit your business scope depending on $current_admin.
I don't think it's just that. It's also the increasingly plausible idea that the US government could pressure the EU by actually or threatening to control, throttle or tax EU access to online platforms such as Zoom, Teams, MS Office, Google docs, Azure or AWS.