Morphis  
   A wireless content transcoder that enables developers to easily create applications that reach all wireless devices. (Java)
   http://www.morphis.org

Jabber  
   An XML-based, open-source system and protocol for real-time messaging and presence notification.
   http://jabber.org

MOSIX  
   Enhances the Linux kernel with cluster computing capabilities, to allow any number of X86/Pentium/AMD based computers to work as if part of a single system. (C) [GNU/Linux]
   http://www.mosix.org/

FIPA  
   The Foundation for Intelligent Physical Agents is a non-profit organisation producing standards for the interoperation of heterogeneous software agents.
   http://fipa.org

Ncat  
   Makes it easy to pipe data between hosts. The syntax is similar to cat, but allows tcp streams to be specified in addition to regular files. (C) [GNU/Linux, Unix]
   http://www.kyne.com.au/~mark/software/ncat.php

Xfiles  
   An interactive utility for comparing and merging one file tree with another over a network. (Java)
   http://www.idiom.com/~zilla/xfiles.html

ZooLib  
   A library allowing to create native executable for GNU/Linux, Unix, Mac OS, BeOS and Windows with little or no need for platform-specific code. (C++)
   http://zoolib.sourceforge.net/

DotGNU Project  
   A Free Software competitor to Microsoft's .NET
   http://dotgnu.org

FIPA-OS  
   Component-based toolkit enabling rapid development of FIPA compliant agents. (Java) [OS Independent]
   http://fipa-os.sourceforge.net

SDSC Matrix Project  
   Offers workflow protocols and workflow language descriptions necessary to build a peer-to- peer infrastructure.
   http://www.npaci.edu/DICE/SRB/matrix/

Berkeley Open Infrastructure for Network Computing (BOINC)  
   A software platform for distributed computing using volunteer computer resources.
   http://boinc.berkeley.edu/

BoincView  
   An addon for BOINC. Under Windows all BOINC Clients in a network can be supervised and partly remote controlled.
   http://boincview.amanheis.de