Pencil is 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. Developed by Pascal Naidon and Patrick Corrieri
License: Open Source
Pencil2D is a beginner-friendly animation tool focused on raster graphics, offering a simple user interface and basic animation features. In contrast, Pencil provides advanced vector capabilities and customization options, making it suitable for professional animators, despite its steeper learning curve.