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I use GIMP for everything. I've decided to stay away from Photoshop because I don't feel like paying hundreds of dollars for something that GIMP can do.
GIMP is the one I use. I find it to be similar to Photoshop however it's a free alternative which suits me seen as I don't really use it for all that much so paying for software wouldn't be beneficial to me. It's seem crazy to pay hundreds for a certain software when a free one can do pretty much the same.
Sketch for my own clients and projects and Adobe XD at work, but I still use PhotoShop CC and Illustrator CC every once in a while, too. I personally prefer Sketch over the other software mentioned. It's lightweight, easy to use, great if you're a developer as well and, like Illustrator, it's vector-based. You should definitely check it out if you work on a Mac.
Adobe XD is, however, pretty similar. It's pretty Sketch for Windows, but Sketch just works better for me personally.
I am also looking forward to Invision Studio. It looks great and it'll be released in January 2018.