* Yugoslavian worker self management (arguably successful: the place had some other problems that hampered them, shall we say) * Mondragon (the world's largest worker cooperative) * John Lewis Partnership/Waitrose (an employee trust with some workplace democracy) * Rehn–Meidner model (which is more about mass ownership across the wider economy and was tried in Sweden if memory serves)

There are a _lot_ of variations of this kind of thing and only some have been tried. Most haven't seen much action at all, just a few sui generis examples - most of the more specific examples above, really.