This online drawing tool can be downloaded and used as an app on your desktop. Plenty of sample charts and diagrams get you started. Easy and intuitive to use.
If only there were a free version of Illustrator … or FreeHand … or CorelDraw. Inkscape aspires to be all these things and has lots of support.
A pretty good alternative to Illustrator that appears to be free with no strings attached. “We’re backed by amazing investors that lets us offer Vectornator to you at no cost.”
Vector drawing program promises intuitive tools, real-time collaboration and scale-able graphics.