nifty-gui is licensed under BSD License:

    http://nifty-gui.lessvoid.com/
    http://sourceforge.net/projects/nifty-gui/


Folder open and close icons are from qooxdoo library:

	qooxdoo Licensing Information
	=============================

	qooxdoo may be used under the terms of either the

	  * GNU Lesser General Public License (LGPL)
	    http://www.gnu.org/licenses/lgpl.html

	or the

	  * Eclipse Public License (EPL)
	    http://www.eclipse.org/org/documents/epl-v10.php

	As a recipient of qooxdoo, you may choose which license to receive the code 
	under. Certain files or entire directories may not be covered by this 
	dual license, but are subject to licenses compatible to both LGPL and EPL.
	License exceptions are explicitly declared in all relevant files or in a 
	LICENSE file in the relevant directories.