[Zope] Zope and OAI-PMH

I've been assigned to integrate an existing academic portal in Plone with the OAI-PMH protocol as a data provider. Searching through this list I found the message below, but no response. On 2/4/05, Yuri <yurj@alfa.it> wrote:

There are several (at least two...) products to manage OAI with Zope. Can someone share his experiences in this list? Thanks :)

The products I've found were: - OAI Pack from Infrae http://www.infrae.com/products/oaipack - ZOpenArchives from Pentila http://www.pentila.com/produits/ZOpenArchives Is anyone here using these (or other) products to implement OAI in Zope or Plone? Which is the more actively supported product? Cheers, Luciano