Interleaves two stacks of layers, with a specified mode and opacity for one of the stacks, that can also be directly merged into the other one.
This is meant to make blending two animations as painless as possible.
The doc: http://gimp-tools.sourceforge.net/tools.shtml
The script: http://sourceforge.net/projects/gimp-tools/files/scripts/
Unless otherwise noted, the rights for the individual plugins are with their respective authors. Logo image by Jakub Steiner.