sK1 2.0 is professional quality open source illustration software … https://www.tromjaro.com/sk1/
Inkscape
Inkscape INSTALL DESCRIPTION: Inkscape is an open-source vector graphics editor similar to Adobe Illustrator, Corel Draw, Freehand, or Xara X. What sets Inkscape apart is its use of Scalable Vectorhttps://www.tromjaro.com/inkscape/