pngnq(1) on Linux
The text 5a6d468296d1, as Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie), Debian 7 (Wheezy), Debian 6.0 (Squeeze) shipped it.
quantize png images
Flags it lists
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-Q -
-V -
-d -
-e -
-f -
-g -
-h -
-n -
-v