This tool was built to make animations that can be controlled through javascript, for web-based games.
The export button at the bottom will output JSON (javascript object notation), which can be copied and pasted into the import box (also at the bottom) on your machine, or anybody else's. For example, you can paste the following output into your own import input box to get miraku's sheet:
["http://www.spriters-resource.com/ds/inuyashadivinejewel/miroku.png",[["Idle",[[74,64,15,16,0,0,150],[74,64,95,16,0,0,150],[74,64,175,16,0,0,150],[74,64,255,16,0,0,150]]],["Idle Back",[[74,64,415,16,0,0,150],[74,64,495,16,0,0,150],[74,64,575,16,0,0,150],[74,64,655,16,0,0,150]]],["Basic Attack",[[74,64,15,176,0,0,150],[74,64,95,176,0,0,150],[74,64,175,176,0,0,150],[74,64,255,175,0,0,150],[74,64,335,176,0,0,150],[74,64,415,176,0,0,150],[74,64,495,176,0,0,150],[74,64,575,176,0,0,150],[74,64,655,176,0,0,150],[74,64,735,176,0,0,150],[74,64,16,248,0,0,2000]]],["Sealing",[[74,64,15,328,0,0,150],[74,64,95,328,0,0,150],[74,64,175,328,0,0,150],[74,64,255,328,0,0,150],[74,64,335,328,0,0,150],[74,64,415,328,0,0,150]]],["Blades of Blood",[[74,64,15,409,0,0,150],[74,64,95,409,0,0,150],[74,64,175,409,0,0,2000]]],["Win",[[74,64,15,488,0,0,150],[74,64,95,488,0,0,150],[74,64,175,488,0,0,150],[74,64,255,488,0,0,150],[74,64,335,488,0,0,150],[74,64,415,488,0,0,150],[74,64,495,488,0,0,150],[74,64,575,488,0,0,150],[74,64,655,488,0,0,150]]],["Effect",[[215,127,17,563,0,0,150],[215,127,247,563,0,0,150]]]]]
It can be manipuated in your own projects by using the sprite sheet js file I built:
(free to use, no credit needed).
I should add the ability to export to animated gif, since not everyone here is a programmer. I'll let you know when that is done.
I might also add a database where people can save their animations, and will let everyone browse what has been made, edit them, and save them as edited copies. Until then, if you want to share, you can just post the export output like I did above.