If you haven’t already checked Affinity Photo you really should. The new version 1.5 just got released and the feature set and speed is more impressive than ever. Affinity was the Mac App of the year in 2015 and it is now also available on Windows.
Check out the video describing the new features on this page. Amongst other things it now has powerful liquify features, panorama editing, HDR editing, focus-stacking and live 3D picture editing.
At $39 launch pricing it is a heck of a good value. Impressive!