Installation

In Blender open Edit, Preferences, Get Extensions, then use Install from Disk and pick the zip.

Usage

1. Open the sidebar (N) in the 3D Viewport and click the Feather tab.
2. Pick a design in the picture gallery and click Add, or click Add a Random Feather. It is also in Shift+A, Mesh, Feather.
3. With the feather selected, change it in the Type, Colour, Set and Output tabs: feather type, length, curve, splits and wear, colours and pattern, or the arrangement (single, wing, tail fan, hand fan, dream catcher, quill pen, bouquet, scatter).
4. For games pick Game Card geometry, then Output, Save Textures to write the colour with alpha, normal and roughness PNG files.
5. Make Static keeps the result as a plain mesh; Delete removes it with its materials and textures.