Here is Ultimate collection of Drop down menu, Professional Drop up menus, Multilevel menus, Image menus, Tabbed Menu, Transparent PNG menu, Sliding Menus using CSS.
Skeleton dropdown menu

Professional drop-down

Transylvania Trip mouseover tabs

Space Drop Down Menu

Sliding doors with a drop line

Tabbed Drop menu

Professional dropline

Flyout hybrid menu

An unordered list with link images

Optiver navigational menu

Zig-zag menu

Professional drop-down

Professional [...]

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