While researching for a palette I wanted for Aftertile, I came across x11 color names, whose colors suited perfeclty my current needs. I proceeded then to build the palette into files I could use both in Aseprite and Photoshop (aseprite has a x11 preset, but there are some repeated colors). So in the .zip you'll find .gpl, .pal and .aco files. The colors in the .aco file are named accordingly.

There also a png in case you need it for another software.

The pieces in the preview were done using this palette.