FREEBSD FreeBSD 5.1 Experimental thread libraries for advanced kernel support and better application multithreading Reduce your administrator workload with jail management -- allowing one server to provide several virtual machines at once Name Service Switch infrastructure allows enterprises to integrate with LDAP and Active Directory services, quickly and seamlessly New support for the AMD64 platform allows FreeBSD to run on single-processor AMD Opteron systems Expanded device drivers that support IBM/Adaptec ServeRAID controllers, USB 2.0 and USB Ethernet adapters, and Promise Serial ATA controllers