Pixate

Powered by Google, Pixate is another prototyping platform that allows web designers to test out mobile interaction designs, animations, and wireframes for Android or iOS devices.

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When in Pixate, you are able to create interface layouts in the form of layers — akin to most graphic design suites — and individual animations through a simple drag and drop function. While these are great to have, what makes Pixate truly useful is its ability to map simulated tactile interactions to these animations through pre-configured options including tap, drag, and double tap. Once you're happy with your prototype, you can deploy and test it on an Android or iOS device.

Google has also done a great job of reducing the learning curve with Pixate. Once you get Pixate up and running, check out their in-depth documentation and tutorialsoffered online to learn the basics of creating your first prototype.