The NeXT IRIX or maybe MacOSX. Eventually to be based on the open-source core of OSX, Darwin. Using the free implementation of OpenSTEP, GNUstep for its desktop and application environment, this WILL be the NeXT multimedia powerhouse.
The Extensible Versioning File System, designed for Windows, Mac OS X, and Linux, introduces native versioning file system functionality to your operating system.
ServicemarX allows you to easily discover, bookmark, and share network services. It extends Bonjour (formerly known as Rendezvous) by expanding its scope Internet-wide. ServicemarX also enables Tiger's Wide Area capabilities. (full source in CVS below)