OpenToonz
An open-source full-featured 2D animation creation software
...It is designed for full animation workflows, including drawing, scanning, cleanup, coloring, compositing, effects, and final output. The project is especially notable because it connects professional animation heritage with an open-source development model. Artists can use it for traditional frame-by-frame animation, digital production pipelines, and experimental visual workflows. It supports desktop use across major operating systems and continues to be maintained by a public contributor community. OpenToonz is best suited for animators, studios, students, and independent creators who need a powerful 2D animation tool without a proprietary license barrier.