Since I do photography, you always have to use a bunch of Photoshop + various plugins.
Personally, I have a set of plug-ins without which I cannot imagine work:
For Gimp there is a set of plug-ins G-in mic. Among this set there are two very useful plugin: Anisotropic smoothing and Bilateral filtering. First good enough can get rid of noise in the photos, the second to get rid of the noise in the pictures.
Minerva79 answered on October 8th 19 at 01:39
Stands trial Nik Software Color Efex Pro 4 I'm thinking to take $99.95 Good for routine work, knows how to make "recipes" to collect those multiple filters in 1-n
marlen_Thompson59 answered on October 8th 19 at 01:41
Plugins from TopazLabs. They had a whole Bundle of effects for photoshop for processing photos.