Fabricating Alternatives - AI-powered card deck to help ideation & brainstorm
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
SnapUp - Wireframe faster / create amazing user interfaces
Sketch - Professional digital design for Mac.
Inkscape - Inkscape is a free, open source professional vector graphics editor for Windows, Mac OS X and Linux.
Invision - Prototyping and collaboration for design teams