The best alternatives to MockingBot are ProtoPie, Figma Academy, and Axure. If these 3 options don't work for you, we've listed a few more alternatives below.
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ProtoPie is the easiest tool used to turn your UI/UX design ideas into highly interactive prototypes for mobile, desktop, web, all the way to IoT. Designers can explore, validate, and test design solutions and ideas by creating very realistic, production-like prototypes without code and the help of engineers.
With Stash, you can browse free Sketch resources, view pages and artboards, and import artboards with a single click. No more downloading entire files just to get an artboard or two.