I would like to learn more about robotic mobile, could anyone recommend some easy and stable one?
EDIT If possible in C, C++ or Java as programming languages. It could run in linux or windows.
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I think the Player Stage Project would be worth a try.
You would maybe getter better answers if you would give more details about what you want to do and what experience you have. Which language do you want to use?
Webots can be an alternative it is a bit pricey though. I used it at university it was stable and pretty easy to get going. Has support for a good amount of different languages.
Also Microsoft has a tool called Robotics Developer Studio. I don't have any experience with it so i can't say much.