Color picker for Plan 9. It has HSLuv, HPLuv, and RGB color space modes and is intended to be used mainly by external programs that need a way to change their color palette.
The implementation of the H* color spaces is taken from here.
See the man page.
The themes are stored in
$home/lib/theme. Once an app that supports
picker is running, make it start the picker and in case you have the
plumb rule from the man page in
/mnt/plumb/rules, you can just plumb
any theme and the app will receive the new colors.