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Sync-in, a new alternative to Nextcloud
(sync-in.com)
Hosting your own services. Preferably at home and on low-power or shared hardware.
Also check out:
Nextcloud started out as file focused, and many people that run Nextcloud since a while now, consider most of the additional features to be unnecessary bloat; I for example stopped using Nextcloud because of its featuritis and abyssal performance.