Framer Studio in a browser and free.
Whoa, so it's like CodePen for Framer.js?
Yes, you can say that :) Plan is to make this very easy to create framer.js based prototypes.
Pretty neat. Any plans to support uploading images?
If anyone is interested in learning Framer - I write a blog and post tutorials at Prototyping with Framer
I also have a video course from O'Reilly that just came out.
Yes, image uploading is on the list.