If you are looking to build an application instead of getting an 
existing one, you can use Drupal and several modules to build it.

There are several faceted search modules available (see 
http://drupal.org/search/apachesolr_search/faceted%20search?filters=type%3Aproject_project). 


For a simple system, you can use:
* Apache Solr module or Faceted Search module for faceted search.
* Tagadelic for tag clouds
* Community Tags for... uhm, community tagging =)
* CCK to hold your content's fields
* Views to make, uhm... views of it =)

_alejandro


Earles, Jill Denae said the following on 08/02/2010 10:58 a.m.:
> I would like recommendations for faceted browsing systems that include
> authentication, and easily support multimedia content and metadata.  The
> ability to add comments and tags to content, and browse by tag cloud is
> also desirable.
>
> My skills include ColdFusion, PHP, CakePHP, and XML/XSL.  The only
> system I've worked with that includes faceted browsing is XTF, and I
> don't think it's well suited to this.  I am willing to learn a new
> language/technology if there is a system that includes most of what I'm
> looking for.
>
> Please let me know of any open-source systems you know of that might be
> suited to this.  If you have time and interest, see the detailed
> description of the system below.
>
> Thank you,
> Jill Earles
>
> Detailed description:
>
> I am planning to build a system to manage a collection of multimedia
> artwork, to include audio, video, images, and text along with
> accompanying metadata.  The system should allow for uploading the
> content and entering metadata, and discovery of content via searching
> and faceted browsing.  Ideally it will also include a couple of ways of
> visually representing the relationships between items (for example, a
> video and the images and audio files that are included in the video, and
> notes about the creative process).  The views we've conceived of at this
> point include a "flow" view that shows relationships with arrows between
> them (showing chronology or this begat that relationship), and a
> "constellation" view that shows all of the related items, with or
> without lines between them.
>
> It needs to have security built in so that only contributing members can
> search and browse the contributions by default.  Ideally, there would be
> an approval process so that a contributor could propose making a work
> public, and if all contributors involved in the work (including any
> components of the work, i.e. the images and audio files included in the
> video) give their approval, the work would be made public.  The public
> site would also have faceted browsing, searching by all metadata that we
> make public, and possibly tag clouds, and the ability to add tags and
> comments about the work.
>
>
>    

-- 
_________________ ___ _ _ _ _ _ _ _
*Ing. Alejandro Garza González*
Coordinación de proyectos y desarrollo de sistemas
Centro Innov@TE, Centro para la Innovación en Tecnología y Educación
Tecnológico de Monterrey

Tel. +52 [81] 8358.2000, Ext. 6751
Enlace intercampus: 80.689.6751, 80.788.6106
http://www.itesm.mx/innovate/

El contenido de este mensaje de datos no se considera oferta, propuesta 
o acuerdo, sino hasta que sea confirmado en documento por escrito que 
contenga la firma autógrafa del apoderado legal del ITESM. El contenido 
de este mensaje de datos es confidencial y se entiende dirigido y para 
uso exclusivo del destinatario, por lo que no podrá distribuirse y/o 
difundirse por ningún medio sin la previa autorización del emisor 
original. Si usted no es el destinatario, se le prohíbe su utilización 
total o parcial para cualquier fin.

The content of this data transmission must not be considered an offer, 
proposal, understanding or agreement unless it is confirmed in a 
document signed by a legal representative of ITESM. The content of this 
data transmission is confidential and is intended to be delivered only 
to the addressees. Therefore, it shall not be distributed and/or 
disclosed through any means without the authorization of the original 
sender. If you are not the addressee, you are forbidden from using it, 
either totally or partially, for any purpose.