ZebraTrace is a simple tool to trace bitmap images into a pattern of curves with a variable width. You can control amount of curves, resolution, min and max width, functions for plotting the curves.
Vectoraster Alternatives for Linux
Vectoraster is not available for Linux but there is one alternative that runs on Linux with similar functionality. The best Linux alternative is ZebraTRACE, which is both free and Open Source. If that doesn't work for you, our users have ranked five alternatives to Vectoraster, but unfortunately only one of them is available for Linux. If you can't find an alternative you can try to remove all filters.