Pencil Project is an open-source GUI prototyping software designed to help businesses draw different types of user interfaces for popular desktop platforms. Key features include inter-page linking, diagram drawing support, clipart browsing, and document export wizard. Developers using Pencil Project can find cliparts by keywords and add them into drawings by a drag-and-drop operation. Cliparts are listed in vector format, which allows users to scale them to appropriate sizes according to individual requirements. The platform enables teams to link elements in a drawing to a specific page in the same document and define the UI flow when creating website or application mockups. Pencil Project supports exporting documents into popular formats, such Inkscape SVG, OpenOffic...