Asesprite is open source, you can compile the source code yourself and then it is free.
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Not sure if you're still looking but you could try something like pixilart or piskel. I believe they're free and on the web. There's also libresprite which is basically a free aseprite.
I've compiled aseprite from source myself and honestly it's worth just paying if you can spare the money. it's a great pixel art program.
I haven't used krita myself but I hear it's in general a good drawing program. Might be worth a look.
download googles new IDE agenic software. Open the folder with the downloaded files you saved on your computer. I would recommend using a drive that doesn’t have your OS or any other important files on it. When you have the folder opened in a new agent window Use Claude Opus or Gemini 3.0’Pro or fast and tell it you want to compile it and get the software running. It shouldn’t have a problem.