The _(Opal | http://www.cs.washington.edu/homes/levy/opal/) project, yet another distributed single (wide) address space (_(SAS)) *(OS) with page-level protection, implemented on top of _(Mach) on Alphas.

The _(OPAL | http://uebb.cs.tu-berlin.de/~opal/) project, a research project on a *(functional) *(programming language).