Murena is a French company founded by Gaƫl Duval, who earlier co-created the Mandrake Linux distribution and now runs the /e/ Foundation. Its Workspace combines mail, calendar, contacts, a cloud drive and an online office suite, using Nextcloud together with OnlyOffice for the documents, and it keeps everything on servers in Finland under GDPR.
What sets Murena apart is that it is part of a wider deGoogled ecosystem rather than an office suite on its own. Murena Workspace pairs directly with Murena's /e/OS phones, so you can move your email, files and mobile device away from Google in one go. A free plan gives you 1 GB, and paid tiers add storage from a couple of euros a month.