Free things to use to animate.?

im looking for something that is easier to animate with then windows movie maker. im looking for something that is not a like 60 day trial. and if there is any thing that can make pictures go less than .250 sec for picture duration? and if there is something that isnt easier than windows movie maker still tell me about it. but DO NOT tell me any thing you have to buy or have a free 60 day like trial haha lol