This extension will re-layer your selected items or the whole document according to their color (stroke or fill). Each style will be put onto it's own layer. This way you can devide elements by their colors with ease. It does some basic-only handling of gradient styles. See also https://inkscape.org/~MarioVoigt/%E2%98%85remove-empty-groups for useful cleaning extension. Notes: - includes "Apply Transformations" extension
This plugin is a bit similar to Blueprint Maker but has a more special use case and a lot of options! It is useful for adjusting the stroke width and opacity of large groups. Usually for good laser cutting the line width has to match a maximum width to be recognized as a hairline. Additionally often opacity issues cause that lines are missed by laser cutter. Docs: https://stadtfabrikanten.org/display/IFM/Cleanup+Styles