OpenToonz is a free and open-source animation software that allows users to create 2D animations. It is based on the Toonz software, which has been used in professional animation studios for years. OpenToonz provides a variety of tools for drawing, coloring, and animating, making it suitable for both beginners and experienced animators. The software supports various features like bitmap and vector drawing, as well as effects and compositing tools. It also allows for the integration of GIMP and Spine, enhancing its capabilities. OpenToonz is widely used in the animation community for its flexibility and powerful features.