Vince Bonfanti is asking on his blog would it be worth open sourcing Bluedragon. He has set out quite a few questions like "Which edition would you want to see" and though all viable I think the answers might not be as helpful as they appear.
Open source is great, but i'll be first to put my hand up in saying that its good cause its free. Sure i've brought wish list items for developers to say thank you but to most developers cost is everything. That's not to say you cannot make a profit here though!