The Pencil Project's unique mission is to build a free and opensource tool for making diagrams and GUI prototyping that everyone can use.
Licensing and Versions:
Pencil will always be free as it is released under the GPL version 2 and is available for virtually all platforms that Firefox 3 can run. The first version of Pencil is tested against GNU/Linux 2.6 (Fedora, Ubuntu and Arch) with GTK+, Windows XP and Windows Vista/7.
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