Recommended and mentioned products
With Nextcloud enterprises host their own secure cloud solution for storage, collaboration & communication from any device, anywhere.
Rockstor is a free and open source NAS (Network Attached Storage) operating system.
Rockstor is another one that rarely gets talked about. I never used it, but it looks interesting and might be good if someone wants a WebUI for managing btrfs.
OpenMediaVault is the next generation network attached storage (NAS) solution based on Debian Linux.
Anyway, I also use ZFS. My server distro of choice is OpenMediaVault, which has a great ZFS plugin that allows easy management via Web UI.