Inkscape

The BioVoxxel extension takes all selected objects and sorts their Z-order by the chosen attribute (ID, title, or label) in alphanumerical order. It is most useful if objects are somehow labeled in a numerical way and should e.g. be laid out in a grid prior to using Inkscape's grid arrange function and all objects are still vertically and horizontally aligned on top of each other.
The extension was created and mist meant to be used together with the BioVoxxel Figure Tools in the software Fiji for the preparation of scientific publication figures in case image import does not respect Z-ordering.

Download and extract into Inkscape's extension subfolder. Restart Inkscape. There should be a BioVoxxel submenu under the Extension menus available