ways to export layers from Gimp

From

https://askubuntu.com/questions/485917/gimp-export-every-layer-as-a-separate-png-image

 

If PNG is an acceptable output format, one option is to export it as Open Raster (.ora), an open specification for layered-image files.

1. Export Image as Open Raster (.ora)
   File -> Export As ...
   myfile.ora
2. Open myfile.ora as an archive, with a program like file-roller or 7zip.
   On Ubuntu:
   

   $ file-roller myfile.ora
   

   (alternatively)
   

   $ unzip myfile.ora
   

   All your layers will be png images under /data, Extract them and use at will.
   
   Apparently Gimp 2.10 onwards, ORA support is dropped.