Sketch / Adobe XD / Figma / InVision / Framer / Marvel

[jcklpe]

An application that can be used to mockup UI wireframes, and prototype applications, flows etc

[jcklpe]

https://penpot.app/

[jcklpe]

https://www.quant-ux.com/#/

[jcklpe]

This is more for presentation, basically an open source Invision: https://presentator.io/