eg https://en.wikipedia.org/wiki/Mondragon_Corporation (discussed on HN https://news.ycombinator.com/item?id=22287794 and https://news.ycombinator.com/item?id=22287794)

or https://en.wikipedia.org/wiki/Igalia (can't find any discussion related to their coop model - there is https://news.ycombinator.com/item?id=37799973 without any comment )