VPaint is described as 'was 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' and is an app in the Photos & Graphics category. There are four alternatives to VPaint for Linux, Windows, Mac and Online / Web-based. The best alternative is OpenToonz, which is both free and Open Source. Other great apps like VPaint are Synfig Studio (Free, Open Source), enve (Free, Open Source) and Expressive Animator (Free, Open Source).
Synfig is a free and open-source, industrial-strength, vector-based 2D animation app designed for producing feature-film animations. It eliminates the need to create animations frame by frame. It is available for Windows, Linux, and macOS.
Free and open-source software for creating amazing 2D motion graphics and vector animations. Free and open-source We believe that everyone should be free to learn and create professional designs and animations, or at least to have a chance at doing it.