Ubuntu Mockup Tool. You can test both versions free for 30 days before deciding on a payment version. The collaborative wireframing and prototyping tool wondershare mockitt is the perfect fit for ux ui designers.
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Pencil has lot of great features ui elements icons etc that allow you to easily create sketches for desktop and web apps. You could probably use it for software application interface development as well. It s a cross platform application available in stand alone form or as a firefox add on.
The tool is free to use with a limitation of one project and limited elements in the library.
Point and curve smoothly. This is a webui mockup tool that allows you to open or inspect any psd sketch or other design formats. It s very quick and web based so it will definitely work in ubuntu. Pencil free and open source sketching tool it s a free and open source sketching prototyping tool.
