Open in what way..

AROS is as open AmigaOS as it can legaly be. As long as IP holders cling on 15 year's old technoloy it'll be it.

Open Hardware.. Similar problems there. Besides original chipset internals documentation is well hidden (or lost?) and would be essential on making open system compatible. I'm not saying HW-duplication would be impossible today's technology but quite frankly it'll need a considerable amount of Hardware tallented and experienced people. And what I see on net these days, there are allmost none.

Edit
If you mean that recently started attempt to make common definition for making software porting easier to new systems (Os4,MosrphOS,Aros). Well.. A nice idea and if they can produce one site for all necessary tools and documents it's really good to have. But frankly I don't expect too much co-operation from closed-Amiga team.