This module integrates jqueryFileTree [0].

controller/connectors/jqueryFileTree.rb is a Sinatra implementation of
the server-side connector: it's strongly modeled on 
connectors/jqueryFileTree.rb, the CGI example provided in the download [2]. 

jqueryFileTree is dual-licensed under the GNU General Public License and 
the MIT License and is copyright 2008 A Beautiful Site, LLC [3].

jQuery JavaScript Library [4] is Copyright 2011, John Resig, dual licensed 
under the MIT or GPL Version 2.

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[0] http://www.abeautifulsite.net/blog/2008/03/jquery-file-tree/

[1] http://www.abeautifulsite.net/blog/2008/03/jquery-file-tree/#connectors

[2] http://labs.abeautifulsite.net/archived/jquery-fileTree/jquery.fileTree-1.01.zip

[3] http://www.abeautifulsite.net/

[4] http://jquery.com/