The first one is a Hungarian animation, Maestro by Kedd Bemutatja, a computer generated short about a cuckoo clock. It was nominated in 2007 for the Oscar, and has won three other awards. I actually came across this a while ago when I was doing research for a project. The story line isn't so bad, but I just find it boring and not in the slightest bit appealing, the colours are drab as is the lighting, and I don't care much for the character design.
The Second short is an Australian short, Harvie Krumpet by Adam Elliot, a stop motion animation made using clay models about the life of a polish imigrant with incredibly bad luck. The character design is basic but works well and I really like the animation overall. The story is really quite sad, but still manages to be quite amusing, probably due to the way it's narrated like a childrens TV programme. It won the Oscar in 2004 along with 19 other awards!
The Third one is Anna and Bella, a dutch film about two sisters looking back on their life together. It won the oscar in 1986, and won one other award. I very much like the style of animation, it reminds me a little of older disney films, and reminds me of one of my favourite graphic novels, Tamara Drewe by Posy Simmonds who has the same sketchy-pencil style.