Amoeba  
   Powerful free, open source, microkernel-based system that turns a collection of workstations or single-board computers into a transparent distributed system. Used in academia, industry, and government for many years. Runs on many platforms.
   http://www.cs.vu.nl/pub/amoeba/

Amoeba Distributed Operating System  
   Technical paper, describes Amoeba, with special focus on its object-based design and use of capabilities, and its innovative Wide Area Network communication scheme; ends by comparing Amoeba and the Sprite distributed OS.
   http://www.cs.unc.edu/~sharma/professional/papers/amoeba/amoeba.html

Bibliography on the Distributed Operating System Amoeba  
   Part of the Computer Science Bibliographies: search, browsing, statistics.
   http://liinwww.ira.uka.de/bibliography/Distributed/amoeba.html