Ubuntu Mockup Tool. For ubuntu native tools are also available or you can just use the web based mockup tools. Pencil is built for the purpose of providing a free and open source gui prototyping tool that people can easily install and use to create mockups in popular desktop platforms.
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Mockflow is ui mockup online tool that helps designers to plan better and sketch interface layouts in a shorter time without any complexity. In the tool you can use different features such as editor preview components iterate etc. An open source gui prototyping tool that s available for all platforms.
Mockplus is a quick wireframe tool which is created by the fast growing startup jongde software llc.
Pencil has lot of great features ui elements icons etc that allow you to easily create sketches for desktop and web apps. Please note that these are unstable builds that contains bleeding edge code. Mockoon is the easiest and quickest way to run mock apis locally. Pencil is built for the purpose of providing a free and open source gui prototyping tool that people can easily install and use to create mockups in popular desktop platforms.
