A free open source animation tool.
Ranked in these QuestionsQuestion Ranking
Pro Animation reuse/clone
Create once and use the same animation for different characters just by simply cloning the same animation for the new characters.
Pro Completely programmable animations
Watching and moving can be programed depending upon certain events.
Pro Color transform, changeable Z-Order
Can easily change the Z-Order of a sprite during an animation and can also change the color mask on a sprite, in between an animation.
Pro Animation speed changing, bone scaling, switching postures
Size as well as animation speed can be easily changed during an animation.
Pro Multiresolution with texture scale
Can easily export to different texture sizes to target multiple resolution platforms.
Pro Animation weight
This is a very useful feature because you can make a walk animation that you can simply change the animation weight to see the character start running, because it will increase the scale of the movement of the bones in the animation. This will increase the hand and the leg swing as you increase the animation weight and the character, making it appear as though it is running.
Pro Switch sprites
Can easily switch sprites in between the animations like switching clothes and other multiple behaviors.
Pro Nesting skeleton, timeline tween
You can nest skeletons and change the timeline of the animation in between the animations in order to make some cool effects.
Pro Flash Pro extension, WYSWYG
There is an extension available for Adobe Flash users, which gives a WYSWYG design window inside of flash.