Proprietary, download 30-day trial version has a $179 cost for the serial number, but it runs in Linux. To run in 64-bit Ubuntu, you need "getlibs" and the installed AnimeStudio. Command-line getlibs /AnimiStudioPro/ASP.donotrunme (pointing getlibs to the binary executable). getlibs will note you need the 32-bit graphics libraries and the ia32. Works very well. Try the trial version. Get it at:

eFrontier Main Page

The most innovative feature is called bones. Add bones to vector or bitmap images and "warp" for a range of animated moves. In the Linux version, the only complete export is .swf -- Flash file format. Otherwise, export image frames into a folder, use Kdenlive to make a film clip.