If you are looking for plugins to Alfresco Share, Will Abson (personal blog) has created an excellent collection of dashlets, themes and document actions available at Share Extras. To this collection I have contributed a dashlet, Google Site News, the first version created soon after the release of the initial release of Alfresco Share. It has been available as part of the Alfresco Developer Toolbox downloadable from the Alfresco web site.
Google Site News dashlet with Drag and drop configuration
2011-03