[Seth]

I want to start developing small 3D applications for fun, but I still don't know what platform use to do it.
The apps I want to create will be to visualize 3 dimensional data (nothing fancy) and some simples games like laberynths and such. I'd like a platform that can run both on Windows and Linux.

Should I use OpenGL? Is there a better choice? And if you think I should use it, I have to use C/C++ or can I use Java?

Any help is appreciated.

[Oler1s]

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but I still don't know what platform use to do it.

What do you think platform means?

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Should I use OpenGL?

As opposed to?

You've got the following options on desktop systems. OpenGL, Direct3D (on Windows) for a rendering pipeline that can be supported by a graphics card, the native OS APIs, and a third party library that provides an abstraction, e.g. Cairo.

You need to pick what you think is appropriate.