You read the tittle right!!! Today Google announced that their full Nik Collection is now 100% free. You can download it here.
The Nik Collection is comprised of seven desktop plug-ins that provide a powerful range of photo editing capabilities — from filter applications that improve color correction, to retouching and creative effects, to image sharpening that brings out all the hidden details, to the ability to make adjustments to the color and tonality of images.