Fabricating Alternatives - AI-powered card deck to help ideation & brainstorm
Sketch - Professional digital design for Mac.
SnapUp - Wireframe faster / create amazing user interfaces
Inkscape - Inkscape is a free, open source professional vector graphics editor for Windows, Mac OS X and Linux.
Adobe Photoshop - Adobe Photoshop is a webtop application for editing images and photos online.
VectorScribe - The missing toolbox for Adobe Illustrator.