An animator can't do much without the right tools, namely powerful software. Here are a few free and open source alternatives for great animation software.
Studio Ghibli's Animation Software Is Now Free | The Creators Project
PowToon is a free business animation software and PowerPoint alternative
Finally create and finish my animation ideas - 3d animation pipeline
If you've ever wanted to know how the animators at Pixar do it, then you need to check out the Pixar in a Box classes from Khan Academy.
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All About Animation: Free Download Maya Rigs: Bird | Horse | Ant | Creature & many more
powtoon, creative presentations, garden media group
50 free animation tools and resources for digital learners #edtech
Free Download: Blender Sculpting Cheat Sheet – AgenZasBrothers | Blender 3D Training, 3D Animation, Film Production