Figma is a great alterative for whose who don't live in Apple Eco-system
Microsoft SketchFlow (part of Expression Studio Ultimate 4) is awesome for interactive prototyping.
It makes WPF applications, which are arguably more suitable for WPF apps on .NET or Silverlight ... but can really be used for anything with a UI.
What are the free (and windows friendly), alternatives for prototyping?
What do you think about Adobe Muse CC?
Btw, great post Ali!, i would try it but don't have a Mac.
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