It’s a gallery tree plugin that means every gallery can have one or more sub galleries. It’s perfectly suitable for portfolio gallery. It’s fully responsive and also usable for other purposes like navigation, galleries etc. Its features :

• Flat UI.
• Supported by all major browsers.
• Responsive design.
• 5 layouts included.
• Own layout can be customized.
• Almost fully css customizable.
• Metro and iOS7 inspired.

codecanyon-7464170-jquery-portfolio-gallery-tree.zip