Ask HN: Apple Photo Alternatives?

Is there any open source alternative to Apple Photos? I have run out of room on my iCloud and don't want to be stuck with paying forever. But, the organization of photos is so nice. I tried to download my data but they use separate files to track metadata. Is there some open source solution (or even a closed-source, non-cloud based one) that will be able to read the metadata files that Apple produced so that I can keep all of my photo info intact?