Kite is a native animation and prototyping design tool for the Mac. It features an intuitive timeline editor, WYSIWYG canvas, and a robust scripting interface. The iOS companion app, Kite Compositor for iOS, allows you to interact with your Kite designs right on your iPhone or iPad.
Adobe XD is a tool that eases the creation of user experiences for the web and mobile applications. It is a single app, coming with a solid set of features, to design, prototype and share. It is built to facilitate the work of today's UX designers.
UX Flow Wireframe Prototyping System is a huge library of mobile and web flowcharts for Sketch. According to our opinion, we selected the most necessary categories and made 450+ flowcharts for planning your projects easier and faster. And we have prepared 4 premade color schemes. A set of them is easy for them to use and customize.
Sketch.The.Ripper shows the contents of any .sketch file: artboards, symbols, and text.
It's useful for HTML coding. Unlike complicated tools like Zeplin, Avocode, and Lunacy, it rips the files quickly, showing all the context that it finds useful. And it's completely free.
Example of a ripped file: http://bit.ly/sketch-the-ripper-sample