ToolBox writes:  

One of NUKE user interfaces, which is a critical but has been ignored, is navigation which supports multi-layered, dynamical, visually organizing, multi-lingual and professional navigation.
The present package, Hierarchical Category Model of dynamic navigation based on multi-layered menu system, is in public. This package includes the following features.

1. Unlimited Multi-layered Category of Drop-Down menus
2. CSS-based rendering
3. Front-end Theme Synchronization
4. Admininistration Menu Supports
5. Categorical menus with icons
6. Easy administration through Visual Design
7. Differential Assignment of Group Permissions and User Permissions
8. Assigning menus and visual orgnization
9. Esay migration between menu levels
10. Multilingual modes and selective menu organization.

Docs and manuals: http://www.nukekorea.net/modules.php?name=Content&pa=showpage&pid=35&start=0
Download (Registration Required): http://www.nukekorea.net/modules.php?name=Downloads&d_op=viewdownload&cid=1
Technical Design and Supports: http://www.nukekorea.net/modules.php?name=phpBB3&file=viewforum&f=32