FreeNAS - https://www.freenas.org/
Unraid - https://unraid.net/
OpenMediaVault - https://www.openmediavault.org/
You also have: https://xpenology.org/
* it’s closed source, a security concern
* the encryption is bad. There is even apparently a universal key (unless you opt for not using its key management system)
https://blog.elcomsoft.com/2019/11/synology-nas-encryption-f...
For myself, I am down to:
- Proprietary blobs used to interface with hardware (e.g. shipped with Fedora, used at boot time). I do not currently have a plan to address these.
- Proprietary applications/services that I am unable to uninstall from my locked-down Android phone (e.g. Google Play Services). Planned to buy a Librem 5 as my next phone, if I deem it functional enough when my current phone breaks.
- Proprietary chat applications for communicating with others (read: as a compromise to not withdraw from society): snapchat, discord, slack, zoom. No concrete plan to stop using these, but ongoing effort to convince others to use FLO tools instead (Signal, matrix/element, jitsi meet) and to compartmentalize and isolate them from the rest of my computing.
- Android studio. Rarely used. Won't need after I switch phones.
- Turbotax and associated Windows install, on separate hardware. Used once yearly. Planned to learn enough tax law to file by hand, or hire an accountant to do my taxes.
- Many games. I consider this acceptable given few FLO alternatives of vaguely comparable quality. In the past I have run a separate Linux install for gaming, but found that less than ideal. Planned to use a separate user account instead, or maybe a chroot or jail.
- Windows install, on a separate drive. Rarely used (maybe one week per year, usually for a game that doesn't work in wine). Planned to dump eventually -- at this point there are enough games that run natively on Linux or work in wine that I will never run out of quality games to play (especially as I have less and less time for this hobby).
...and I honestly can't think of anything else.