What are some alternatives?
Inkscape - Inkscape is a free, open source professional vector graphics editor for Windows, Mac OS X and Linux.
Sketch - Professional digital design for Mac.
Adobe Illustrator CC - Adobe Illustrator CC is a commercial vector graphics editor.
Vectr - Free vector graphics editor. A simple yet powerful web and desktop cross-platform tool for everyone.
Boxy SVG - Boxy SVG is a vector graphic editor built for the modern web.
Affinity Designer - Professional creative software, exclusively for Mac.