Amazon

:root {
  --color-1: #337b53;
  --color-2: #007562;
  --color-3: #007677;
}

.ASE works in Adobe apps and several others that adopted the format. .sketchpalette imports into Sketch. .swatches (Procreate) follows a community-documented structure, since Procreate doesn't publish an official spec, so treat it as best-effort. .pptx is a real PowerPoint file with the palette applied as the deck's theme colors (not just two sample slides); Keynote opens .pptx files directly too.