People that stacked Adobe Photoshop
Whether I'm designing a cover for a self-published short story or just getting a map ready for D&D, Photoshop is my go-to. There are probably cheaper tools out there, but this is what I learned with.
It is the most commonly used and arguably the most powerful photo creation and manipulation software to date. It's well designed, always works, there are millions of tutorials, and should you choose you can master Photoshop and turn it into a career in fairly short order..