DxO Optic Pro 11, for MacOS and Windows, is a state of the art RAW processor - some think it is superior to Adobe Camera Raw.
Because DxO have a new product (DxO PhotoLab), its predecessor is being offered free for a limited period. Get it now before the end of November, it is well worth having.
Here is the download link. You can check if your camera/lenses are supported here
I know that details of this free offer have been mentioned elsewhere in the forum, but some of you may have missed it.