One of the really handy features in ON1 Photo RAW 2017 are the new local adjustment layers and local adjustment tools. They are available with both Develop and Effects and shared between the two modules. They allow you to selectively apply edits or effects to certain areas of your photo.
New Local Adjustments
ON1 Photo RAW 2018.5 is the only photo editor designed by photographers, for photographers, and it is the best alternative to Adobe® Lightroom® and Photoshop®. It works on a Mac or Windows and requires no subscription. Try it free!