From mind to design in minutes
tinkercad.com/Tinkercad is a free, easy-to-use app for 3D design, electronics, and coding.
Penpot - Design Freedom for Teams
penpot.app/The open-source solution for design and prototyping.
blokdots
blokdots.com/blokdots is a simple to use software to build interactive hardware prototypes without a line of code.
Meet Alva
meetalva.io/Create living prototypes with code components. Design with the same components your engineers are using for production.
Relate - Design and develop at the same time
relate.app/Relate is the first interface design tool that empowers design and development teams to collaborate in the creation of digital products - visually and straightforwardly
Sketchsheets - Ready to print sketch sheet templates for UX designers
sketchsheets.com/Sketchsheets is an open source project dedicated to providing free printable templates of the latest devices and platforms for wireframing designs.
Only One Deliverable Matters | Big Medium
bigmedium.com/ideas/only-one-deliverable-matters.htmlToo much design effort goes into artifacts that are not part of the working software. There’s a better way to work.
Sound Kit for Prototypes | Facebook Design
facebook.design/soundkitA collection of interaction sounds for prototypes.