I am searching for a tool which helps me to create a basic UI mockup for a consumer product. When I am searching online I only find tools that are aimed on website design and computer software ui design. It has to be very simple however it would be nice if I could have some sort of interaction.
We use http://keynotopia.com/. uses keynote or powerpoint into the best rapid prototyping tool for creating mobile, web and desktop app mockups.
Also running it on an actual devices gives extra UX feedback.
Here's a collection 11 free and very good tools for wireframing and prototyping: 10 FREE TOOLS
However, I often use Adobe Fireworks for prototyping and it actually works, take a look at that too.