List of free prototyping stuff for developer๐๐ฝ
If you're looking for all programming tools around prototyping (not just free). Check this page List of prototyping Programming Tools

Framer
Itโs interactive design made simpleโno code required, browser-based, and free for everyone. Realistic prototypes in half the time.
Tag: ui-design, prototyping
Unlimited viewers Up to 2 editors Up to 3 projects