Pencil2D is a free and open-source 2D animation software available for Windows, Mac OS, and Linux. Developed by Matt Chang
License: Open Source
Pencil2D is ideal for users focused on traditional frame-by-frame animation with a simple interface, but lacks vector support and audio syncing. In contrast, Tupi is more suited for beginners looking for vector graphic capabilities and audio syncing, although it may be more complex for advanced animation needs.