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Alternative to Google Photos
(self.foss)
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
This community's icon was made by Aaron Schneider, under the CC-BY-NC-SA 4.0 license.
Synology DSM is only available on Synology hardware. It is not something you can buy from them and install on your own NAS.
However...
There is Xpenology that works fairly well. I ran one for a couple of years and loved it, but updating it difficult and potentially dangerous to your data, some apps will not work and the latest DSM7 does not look like it will ever be available. I finally gave up last year and bought an Asustor AS3304T. Their ASM software and apps are not on par with Synology but it gets the job done for me at a significantly cheaper price.