Valve has released Source Filmmaker, a free application that allow you to create videos with the characters of Valve’s games.

You can remodel the characters, changing your facial expressions and stances, manipulate the environment and more.

It needs 11GBs in your Hard Disk and can be downloaded directly from Steam, clicking http://store.steampowered.com/app/1840/

There’s a video that shows what is possible do with Filmmaker.