I was into 3D since high school years. My first experience was making 3D models with 3Dsmax.
Among them ThreeJS (http://threejs.org/) is one the best choice to use IMHO. It is more mature comparing to others, and there are many examples to follow.
It is better to see rather than reading, Check out this ThreeJS example: http://www.georgeandjonathan.com/#6
Is not it amazing?
Dynamic, interactive and open-source 3D visualization directly on your Chrome Browser.
It runs on the latest Android Tablets and Phones too.
In few years, I think everyone will be able to browse 3D sites on their devices.
So, by using this library I am trying to make some impressing data visualization.
Here is how I visualized the Word Cloud in 3D:
Unfortunately, it is just a screenshot from my browser and next time I am going to upload live demo.