What are some free but decent alternatives to Photoshop?

I’m not sure if I want to spend $20.99 a month.

Krita

GIMP

GIMP I use it from time to time, it is the closest free alternative to Adobe Photoshop i’ve seen.

@Background Pony #E90E
 
@Background Pony #5BEC
 
@Ninjanaut1000
 
Thank you all.

Depends of what you want to do with it. GIMP is good as a general-purpose image editor, but is not really specialized into artworks creation. Krita, on the other hand, is.
 
MyPaint has some interesting qualities too (such as infinite canvas) didn’t used it for a while though. It is for artists who like to do everything themselves, without relying too much on the software.
 
Inkscape may be for you if you’re into vector / staying close to the show’s style

If you want a raster image photo editor?  
GIMP.
 
Ya want a little sum sum’n on the artistic side? Illustration or concept art?
 
Krita  
Autodesk Sketchbok  
Paint.Net
 
Want that infinitely scale-able graphic design?
 
Inkscape
 
Manga or or comic book?
 
Clip Studio Paint. The upgrade to Pro (fitty Vbucks, 25 when they discount) is worth it.
 
I personally use Clip Studio Paint for drawing and GIMP for photo editing.

There’s an in browser Photoshop clone  
https://www.photopea.com/

Since no one else said it, for drawing, Firealpaca is good
 
Personally I use Krita

I’d say cracked Paint Tool Sai2 (as free) and Clip Studio Paint (but as an trial. Then it is one time buy)

Depends what’s for
 
If for vector: Inkscape, (Photoshop’s sister) Illustrator, CorelDraw  
If for drawing: Krita