Inkscape - Inkscape is a free, open source professional vector graphics editor for Windows, Mac OS X and Linux.
Framer - 🔥 Design real websites right on the canvas.
YouiDraw - Draw and Design Vector Graphics, Logo, Text, icon in the Cloud.
MontageJS - MontageJS framework is a platform to develop and create single page applications (which load single HTML page and dynamically update the app as the user puts in inputs or requests or interacts with the page.) with ease.
Sketch - Professional digital design for Mac.
Marvel - Turn sketches, mockups and designs into web, iPhone, iOS, Android and Apple Watch app prototypes.