Is there any other library instead of OpenGl for 3D game development

The two main choices for 3D game development are OpenGL and Microsoft's DirectX. Both technologies allow you to access the video card for increased processing power, and both are used frequently in computer games. However, DirectX is only compatible with Windows so you would not be able to easily port your game to the Mac or to Linux.

If you're just having trouble with the OpenGL API, you might want to look into a higher-level engine like Ogre or Crystal Space (both of these are free).