I have C1 and Lightroom 5 kicking around, and I’m currently writing an open-source app to replace LR5’s image organization features.
Just curious, why not use DarkTable or DigiKam?
They're buggy and unreliable, and often slow. I'm on a Mac. They're good when they work but they just aren't ready for primetime. Ok, I might be picky, but I have been a photographer for almost 30 years and I invest in tools for long periods, like I'll want ten years of use from a camera, and I'll want an investment in learning software to pay off. I wish that a lot of the FOSS tools actually focused on UX and what users really need.
Same, and you can still own an actual copy of the software.