There is Nextcloud which is not only eu-based but open source as well. You choose what parts you run but it competes with most of workspace and office 365 (everything but the arguably obscure stuff*). I use all three (g-workspace, office 365 and nextcloud) and I strongly prefer nextcloud excluding my private preference of open source - even more so from an administrative perspective (fuck the workspace admin pages, they causes me so much trouble)
*except email-server which although easy to add on trough stalwart or external email provider is technically not part of the nextcloud ecosystem (webmail is however)
I don't know what you're smoking if you prefer Nextcloud over Google Workspace from an admin point of view, but hey, good for you.
But no, Nextcloud is not comparable to Google Workspace. Not as a user (their office web implementation is spotty at best, constantly crashes and disconnects; their calendar, meeting and chat apps are barebones; the clients regularly corrupt files or have issues syncing, etc.), and definitely not as an administrator: You have to constantly deal with manually updating the instance, re-enabling "incompatible" apps for some reason, deal with the updater taking 4 hours to download the zip file because their servers are overloaded again, updating the database server or PHP version because it will soon no longer be supported, etc. How is that better than having to navigate the Google Workspace admin interface every few months?
Cloudflare I don't know if there are good competitors by my own experience, but some are listed here: https://european-alternatives.eu/alternative-to/cloudflare
*except email-server which although easy to add on trough stalwart or external email provider is technically not part of the nextcloud ecosystem (webmail is however)