Some useful Links
Blender is very powerful 3D modeling and animating, open source software. It runs on all current operating systems.
Blender is surrounded by a huge community all over the world. That makes it easy to find tutorials and solutions to problems in one of the numberous forums.
There are a lot of youtube videos about Blender. Most of them are very good for beginners, but also for advanced Blender users there are some very helpful tutorials.
Advanced Blender Animations
If you are not yet convinced of the power of Blender watch some of these videos. Developers of Blender, but also others, use Blender for very professional purposes