From Google.

Google has announced that the excellent collection of processing plugins from NIK for Lightroom and Photoshop is now free. Click the image for the download site:

Click to go to the download page.

While this probably means that development of the code has ceased, who cares? They are great now and are not about to get any worse. If you use the desktop versions of LR and PS like I do, preferring not to pay rent to rapacious Adobe for its CC cloud versions, then you will not have every upgrade breaking your plugins’ functionality.