When a friend shared with me the news from Google that NIK software was released for free, I was excited. I downloaded it right away and then came across some negative aspects of the free download.
The bad news is that it's no longer being supported, so what you see is what you get.
Free is as free does. Still, I've played with it and while it's not Lightroom, it's not half bad. I would certainly download this and play with it until you wake up one day and find your OS no longer plays nice with it.