Have a few extra dollars? Why not direct it here? Spriter's an animation tool that is designed for the creation of 'highly detailed 2D game characters and effects in an intuitive, visual editor'. And so far, it looks kinda superb. According to the description, it looks like they're shooting to provide the world with a 3rd party animation software that is capable of recreating the multi-image animation technique utilized in games like Muramasa and Shank. What makes it even more impressive is the fact that they're aiming to ensure that the results of your work can be used on every major game authoring tool ever.

Those skeptical about the idea may want to check out the beta version over here first. As for everyone else, well, extensive information can be found over at the Kickstarter page here.