Is XenServer still free?

I'm curious to know if XenServer, the open-source virtualization platform, is still available for free? As a professional in the cryptocurrency and finance field, I'm always on the lookout for cost-effective solutions that can streamline my operations. With the ever-evolving landscape of technology, it's important to stay informed about the latest changes in software licensing and availability. So, is XenServer still accessible as a free tool, or have there been any recent updates that have altered its pricing structure?