The last Amiga version (1994) of TVPaint 3.59 is available for free download !
TVPaint is a three layer paint and compositing program. It includes tools like Pen, Airbrush, Chalk, Pencil, Crayon, and cutout Brushes along with an easy to use scripting language for multiple task operations. There are over 2400 drawing and image processing combinations available. In addition, it includes the ability to do bump maps, smears, perspectives, blur, grain, and chroma key.
TVPaint 3.59 free download here (.zip)
To use it, you will need to use an Amiga emulator :
WinUAE (PC/Windows version)
macUAE (Mac version)