⋄   Free and potentially useful tools that I've stumbled upon   ⋄

I'll update it along the way. You're welcome to suggest to add something to the list.

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Tools I use for graphical elements of my itch.io pages:

https://www.getpaint.net/ (using it to make textures and almost every other visuals)

https://fotoram.io/editor/ (using layered frames for adding crunchiness to the thumbnails)

https://photomosh.com/app/ (using it for making animated visuals)

Other handy tools for game development that I've stumbled upon:

https://tools.wwwtyro.net/space-3d/index.html (cubemap skybox generator)

https://www.imgonline.com.ua/eng/make-seamless-texture.php (almost perfect photo-to-seamless-texture maker)

Resources for Unity:

https://github.com/Kodrin/URP-PSX (URP PSX style shader)