Animation Toolkit 1 - The Players (archived here) was meant to be the
first of two products, with Animation Toolkit 2 - The Stage announced
as its companion. The Stage was apparently never released.

> Animation Toolkit 1 lets users prepare "film clips" of moving
> objects which play back at varying speed, like old-fashioned flip
> books. Drawings are built pixel by pixel in frames, using some of
> the tools from MacPaint. They can be copied and altered easily from
> frame to frame. Each film clip plays repetitiously as it is being
> constructed. A limited animation tool, but a lot of fun.
>
> ? MacUser

Not to be confused with [Sprite Animation Toolkit][1] by Ingemar
Ragnemalm.

Compatibility
Architecture: 68k

  [1]: http://macintoshgarden.org/apps/sprite-animation-toolkit