Meet the Opentoonz family of forks. In case you don't know, these are apps for 2d animation:
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Opentoonz - The original open source fork of the proprietary Toonz, used by Studio Ghbili.
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Tahoma 2d - Aims to be a more user-friendly animation program for digital 2D artists and stop motion animators.
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Opentoonz - Morevna Edition - developed by the creators of Morevna, it includes additional features like Krita-like assistants, advanced color selector and the MyPaint brush engine.