There are two software products named Pencil, that are not related to each other. This article is about the graphical animation software. Pencil uses a unique bitmap/vector drawing interface to produce simple 2D graphics as well as animation. Pencil is written in C++ and is Qt-based. The application license is GNU General Public License. It started as a simple "pencil test" program by Patrick Corrieri, extended to the current Pencil application mainly by Pascal Naidon.