No, I use a Nextcloud provided by a non-profit I know.
Some Nextcloud instances are provided for free by other french non-profit organizations, you can find a list here: [chatons.org](https://www.chatons.org/search/by-service?service_type_targe...). Please checkout their website for details -- provided services and conditions may vary
Do you manage your own server for DavX?
For me personally my list is:
Firefox - with add-ons, I tend to access as many services through the browser rather than via apps.
Feeder - RSS reader
AntennaPod - podcasts