GNU public license

Synfig Studio

Synfig Studio might not be the simplest software to master but once you get it up and running, you'll have a 2D animation software that rivals most of its contemporaries. The best part of all is that it's absolutely free. The program was created to serve as an alternative animation tool and features plenty of features essential to a 2D artists arsenal. Development of the program was spearheaded by Robert Quattlebaum, lead software engineer and founder of the now defunct, Voria Studios. Professionals and non-professional animators will benefit from having this program. It's a software that's packed with features to make work easier and more polished.

Anagramarama

If you can say Anagramarama ten times straight without fail, then you probably have a thing for anagrams. Anagramarama is actually a puzzle word game similar to that of Text Twist, except it's all for free! All you really have to do is come up with as many words as possible from the given letters and you are good to go. Even though it may seem like it, the game is actually fun to play even if you are not a total geek.

Blender

Blender is the perfect all-in one 3D modelling software. Get all the bells and whistles of a commercial animation and modeling software for ZERO dollars. Yes, as unbelievable as it sounds, Blender is an open source software under the GNU Public License. It has become the first choice software for even professional animators and has spawned great animation films as well. Films like Big Buck Bunny and the upcoming film, Sintel, was created from this groundbreaking software.