View-OS is a novel approach to the process/kernel interface. The semantics of each system call can be assigned process by process giving the user the right to decide which view of the system each process has to join. Each process can "see" a different file system structure, networking resources, processor, devices. Moreover some of the resources can be provided by the user herself, thus these resource can be private to the single process and are not known a priori by the system. Groups of processes can share the same view but this is just an optimization to share management methods.
More informations at https://savannah.nongnu.org/projects/view-os/ .
View-OS packages (at present, UMView, its modules, and some kernel patches) have recently been submitted for inclusion in the official Debian repositories. You can look for umview-* and kernel-patch-viewos in the Debian archives.
Some very old Debian packages can be found here: http://www.nongnu.org/view-os/debian/