Is XCP-ng free?

Excuse me, I was just going through some information on XCP-ng and I came across the question of whether it's a free solution or not. Could you please clarify if XCP-ng is indeed free to use and deploy? If it's not entirely free, could you elaborate on what kind of costs or licensing might be involved? I'm particularly interested in using it for my virtualization needs and would appreciate any details you could provide.