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

A software agent framework, which implements the specifications of the Foundation for Intelligent Physical Agents. (Java)
http://www.nortelnetworks.com/products/announcements/fipa/index.html

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

Paul's Unofficial BOINC Documentation Site

Summarizes current information about BOINC projects and usage.
http://boinc-doc.net/