When I develope an HTML editor, I saw that standart colour palette isn't enough for us. Because of this I decided to develope a new colour picker tools.
If you want;
to use the colour picker tools in an HTML editor,
to edit colour cells in editor grid component,
to use colour fields in form panel,
Also, if you need different tools for chosing colours; you can visit and test colour mixer, colour picker, colour palette and colour panel.
I think that these tools are very useful for your applications.