[jackbravo]

There's gcoop (http://gcoop.coop/). A software cooperative in argentina. I think they have around 20 people working on a cooperative model.

[mgbmtl]

Similarly in Montreal: https://www.koumbit.org (legally a non-profit, run mostly by consensus)

[jackbravo]

In a similar vein, there is http://agaric.com/about which is also a software cooperative (or collective? are those the same in the US?) doing Drupal work.