VivaGreen.com
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VivaGreen was a brainchild of Pivotal Ventures Inc. This highly dynamic site featured a variety of advanced Drupal features, including a complex taxonomical structure, ad-hoc user groups, tag clouds, and a customized tabular approach to the "CCK Address" module allowing vendors to be sorted by city, state/province, country, zip/postal code or name. The company was unfortunately unable to secure a new round of funding, and the site was taken offline in 2010.