Ubuntu Mockup Tool. Mockplus is a rapid wireframing tool for designers to create interactive wireframes for websites and mobile apps which enables you to share and test design ideas across pcs and mobile devices from an early stage in the design process. Pencil free and open source sketching tool it s a free and open source sketching prototyping tool.
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It also comes as a standalone version for all major platforms including ubuntu. Pencil has lot of great features ui elements icons etc that allow you to easily create sketches for desktop and web apps. The premium version starting from 8 95 per month gives you access to more elements and animation effects.
If you would like to try every newest feature added by developers you can try the nightly builds created automatically in the build server.
The balsamiq mockup or balsamiq studios is probably the best known web ui mockup tools for free on the list. It also comes as a standalone version for all major platforms including ubuntu. Created on a mission to do faster smarter and easier design mockplus is a quick wireframe tool enables you to do a perfect interactive wireframe and prototype in a minimum of time. Mockplus is a quick wireframe tool which is created by the fast growing startup jongde software llc.