From Newsgroup: rec.arts.animation
Synfig Studio[1] kind of reminds me of older versions of Adobe Flash,
but when last I used it, it was extremely buggy and crashed pretty
frequently. That was a while ago, so it may be better now.
OpenToonz[2] was proprietary animation software used by some high
profile studios, such as Rough Draft and Studio Ghibli, so it should be
fairly stable. It's more geared toward traditional, frame by frame
animation, and AFAIK doesn't have any tweening capability.
In my experience, Blender and Krita are also extremely stable, but but
I'm not much of an animator so I don't use them a whole lot.
[1]
https://www.synfig.org/
[2]
https://opentoonz.github.io/e/
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