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]
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]
SDSC Matrix Project Offers workflow protocols and workflow language descriptions necessary to build a peer-to- peer infrastructure.
Xfiles An interactive utility for comparing and merging one file tree with another over a network. (Java)
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++)