What is vpaint:
VPaint is an experimental vector graphics editor based on the Vector Animation Complex (VAC), a technology developed by a collaboration of researchers at Inria and the University of British Columbia, featured at SIGGRAPH 2015. It allows you to create resolution-independent illustrations and animations using innovative techniques.
it is open source and it has a solution to some of current vector graphic's biggest flaws. See video here:
It also has tweening capabilities, which makes it incredibly powerful as a 2d animation tool:
Posting this with the hope that some of inkscape's developers could look into a way to integrate some of the features into inkscape.