Download the zip file above, extract it and then view all the files one by one.
Also, see the VIDEO / SCREENSHOTS of this tool below.
Although, this Color Picker tool was originally designed on a Mac System,
I find that the List Box implementation and its values selection, using
the down arrow key, is much easier on a Windows / Linux System. So,
using this tool on these operating systems, will be highly beneficial
and faster for design purposes.