Parallel Operating Systems  
   Short, annotated, alphabetically sorted list and links, part of larger system.
   http://www.cs.arizona.edu/people/bridges/os/parallel.html

Cosy  
   Goal: scalability of highly parallel multicomputer systems. Based on small microkernel that does process management, interprocess communication; all other services are processes out of kernel. Processes and address spaces orthogonal, so Cosy process is li
   http://www.uni-paderborn.de/fachbereich/AG/heiss/cosy/

Parallel Systems Group  
   University of Toronto researchers working on all aspects of parallel systems: computer architecture, OSs, compilers, performance evaluation, applications. Home of Hurricane and Tornado OSs, Hector and NUMAchine multiprocessors.
   http://www.eecg.toronto.edu/parallel/