1. Is the program similar in any way to Blender 3D? http://www.blender.org
Both are animation programs and share some of the animation concepts. But they are quite different.
2. Is the program similar in any way to GIMP?
They only share the concept of layers and its blending feature (from top to down). Gimp is raster and no animation and Synfig is vector and 2D animation.
3. Does the program require programming in order to create animation? (I saw some things about programming on the main site)
Absolutely nothing. You just need to know the animation concepts (timeline, waypoint, keyframe, etc.) and the layer composition concepts (layer stack, blending method, encapsulation,...)
Has anyone used Blender 3D and if they have, do they know if any of the skills that I've learned with Blender 3D be useful in Synfig?
If you're animated something in Blender you will enjoy Synfig as well.
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