Paint Palettes is a community add-on for Blender that provides palettes for color and weight paint modes. Its panels appear in the Image Editor and the 3D View, where any paint mode gives access to a Color Palette or Weight Palette panel.
The add-on was part of Blender's 4.1 bundled add-ons and is now offered as it is, with limited support. It was originally written by Dany Lebel (Axon D). Version 0.9.4 was published in May 2024 and lists compatibility with Blender 4.2 LTS and newer.
Paint Palettes is released under the GNU General Public License v2.0 or later and requires no special permissions. It can be added by dragging and dropping into Blender or installing it from disk, with further details available on the developer's page.