Inkscape - Inkscape is a free, open source professional vector graphics editor for Windows, Mac OS X and Linux.
Sketch - Professional digital design for Mac.
Boxy SVG - Boxy SVG is a vector graphic editor built for the modern web.
Affinity Designer - Professional creative software, exclusively for Mac.
AutoDraw - A Google Experiment that helps you draw with relevant suggestions.
Gravit Designer - A cross-platform vector graphics tool, runs as desktop application and in-browser too.