Blender is a free and open-source 2D & 3D computer graphics software tool. you can see the hero film project (2018) that was created with Blender Greace Pencil capabilities. (h/t @juank_mg)
Do donate and support them (if you end up loving the software)
Official Website:
https://www.blender.org/
Office:
1 Kallang Jct
Level 6, Vanguard Building,
Singapore 339263
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Sage Animation.
All Rights Reserved.