Possibly yes, I was a big fan of Flash 8, but of course the older it gets, the more out of date it is, not to mention that I do not believe that Flash 8 will even work on modern Macs anymore (because of Apple dropping 32 bit support).

Right now, I have a couple-year-old permanent license to Toon Boom, which is very good, but of course it is very much not open source (and I do not believe they even let you do permanent licenses anymore). I'm not an animator, I just play with stuff occasionally, so I can't really justify ongoing costs, which is part of why I would prefer an OSS version.