I specifically bought a Philips Hue smart light system for my apartment in order to make it seamlessly adjust its brightness and color temperature according to the calculated altitude of the sun in my location. Surprisingly, the included software didn't support this obvious feature.
I just spent the whole night coding a node.js service that adjusts the lights for me. I'm not done tweaking it yet, but it's already way closer to my specific needs than a shrink-wrapped solution would be.