Hello! I'm making a 2D tile based game and I need a good tool for making character animation. I were searching for a good tool but didn't found anything usable. This animation should be exported as a sprite sheet or something like that. So I don't need a vector animations tools, because it should be done in 8-bit style (check Terraria to understand what I exactly need)

Thank you (:

I feel weird saying this but, can't you just draw each one step by step? I know that there are tools to do that, but if I remember correctly I believe the developers drew them by hand.

Besides that, after looking on google for a few minutes I found

http://www.codeandweb.com/texturepacker

http://itunes.apple.com/us/app/sprite-monkey/id455498432?ls=1&mt=12

not sure what platform you're on so hence the Mac app.

or possibly http://www.adobe.com/devnet/flash/articles/using-sprite-sheet-generator.html ?

What it sounds you are looking for is a pixel art tool. I would imagine Photoshop, GIMP or Paint.net or similar are often used, but you could also try something like http://tilestudio.sourceforge.net/drawing.html. Do a search on "pixel art program" or "sprite editor" for more options.