This is a quick FREE tool : hocuspocus-studio.fr/tools/product/multimesher/
update video with new features : vimeo.com/97308086
it acts like the Mesher, but instead of picking only one source object you can have a list of them.
And with some boolean options to intersect or subtract the meshes.
you can pick splines too !
there is a add list for the boolean addition objects
and another one for the subtract objects
it keeps the animation...modifiers, and the uv's.
and the Source objects remains separate, so it'll not collapse it in one, like the boolean does.
update : bug corrections and more operations lists like intersect and invert