You can define your own objects, transitions, controls and actions.
It is free and open source (GPLv2).
An example of a 3D menu similar to the original Tomb Raider 2 menu, it contains some weapons and a similar background. The menu control is binded to two html buttons and also the name of the selected element is displayed in a html tag under the menu.
An example of a 3D menu featuring the logos of some interesting projects. The menu control is binded to the keyboard, also the enter key is binded to the action of every item on the menu, which is going to the project's website.
Feel free to get in touch with me