evoluspencil

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Pencil

Graphical User Interface - Tool for diagramming and GUI prototyping.
Prototyping Tools - Listed in the “Prototyping Tools” section of the Awesome Mac awesome list.
Prototyping and Mapping - Open-source tool for diagramming and GUI prototyping.

The Pencil Project's unique mission is to build a free and opensource tool for making diagrams and GUI prototyping that everyone can use.