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
Pencil is ideal for users looking for an easy-to-use, collaborative design tool with a focus on vector editing and real-time teamwork. In contrast, Xara Designer Pro offers more advanced features and professional-grade tools, making it suitable for users who need comprehensive vector design capabilities and are willing to invest time to learn the software.