Free Open-Source Artificial Intelligence

I would like to experiment with image editing. Idk, brush up my vacation photos, remove some of the other tourists, make it look like I've been somewhere I haven't... Swap my face onto someone or change my clothes, change the weather/sky... Draw me as a character in some artist's style... If it works well enough, take some of the blurry images from my potato phone camera from 15 years ago and clean them up... The stuff I've seen people on YouTube do with AI.

What's a good and recent model or "editor" to do that? Open-weights please and preferably something I can just use straight away without fiddling 3 hours with some ComfyUI nodes. Bonus points for being efficient and running on my laptop 😅

And is there some Free Software UI / software to make it easy? I mean I'm perfectly able to learn how to provide it with stencils(maybe they don't need that anymore in 2026?) and whatever stuff it needs as input, run it on the commandline... But maybe there's a nice interface like an image editor?

Edit: I forgot: I mentioned different use-cases... Seems to me there are different models for like regular image editing (which gets one image and a prompt as input) and models which get two images as input? Like a picture, and another picture and the instruction to draw this person onto that picture?