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@Janet photoshop, any version really.
the general process:
- load the photo, resize it to be small (i usually get best results between 250-600 pixels on the long side)
- file > export > save for web (you can resize it here too, make sure to use "nearest neighbor" scaling)
- change file type to .gif
- the main things to change in this window are color count & algorithm, and the dithering style.
this one was 93 colors, "windows" color algorithm, diffusion dithering style.
@Janet then when you save it, open it back up and resize it to be big again. use multiples of 100% and nearest neighbor scaling to make sure it stays blocky and even.