I often wonder what an open source OS designed to fulfill the role of mainframes would actually look like. I'm going to describe this really badly, but I see t

I often wonder what an open source OS designed to fulfill the role of mainframes would actually look like. I'm going to describe this really badly, but I see things like Excel and HyperCard, and I really wonder what something acting more like a mainframe with the input sensibilities of user oriented programs like Excel / HyperCard would look like. Maybe I played with Orchestrations in BizTalk a bit too much and really wonder.