An open-source GUI prototyping tool that's available for ALL platforms.

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.

The latest stable version of Pencil is 2.0.3 with many enhancements and bug-fixes.

Project News

November 28th, 2012 - Pencil version 2.0.3 has been released with minor enhancements and bug fixes.