Pencil – GUI prototyping tool

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.

Pencil is shipped with Android and iOS UI stencils pre-installed. This makes it even easier to start protyping apps with a simple installation. Popular drawing features are also implemented in Pencil to simplify the drawing operations.

There are built-in shape collections including general-purpose shapes, flowchart elements, desktop/web UI shapes, Android and iOS GUI shapes.

Pencil also supports connectors which can be used to “wire” shapes together in a diagram. A collection of flowchart shapes are also available for drawing diagrams.

Features include:

  • Bitmap and vector drawing tools.
  • Layers.
  • Camera.
  • Export animations to QuickTime and Flash formats.

Website: pencil.evolus.vn
Support: Wiki
Developer: Pascal Naidon, Patrick Corrieri
License: GNU GPL v2 or later

Pencil
Click image for full size

Pencil is written in JavaScript. Learn JavaScript with our recommended free books and free tutorials.

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