Program for 2D Animation.

Hello.
I'm new in Unity.
After week spended on Javascrpit I thought everything will be easier now, but I was wrong.
I want to make 2D game, something like that:
http://www.youtube.com/watch?v=erMrSf9cjPw
http://www.youtube.com/watch?v=aQx2Roki0kY
I've seen many assets like Smooth Moves or Unmontion but I need someting for FREE.
Any ideas?
Sorry for my english.