#lcdtouchscreen
It is a free GUI software designed for web and mobile apps. You can create high-fidelity prototypes using it. For more solid features, you can also opt for a paid version. It is very effective for wireframing UI/UX design. You can share the prototypes created using justinmind through the cloud and simulated through mobile devices as well. It also produces HTML for the entire set of prototypes.
https://bit.ly/stoneitech

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