The openMosix User Space Cluster Daemon
is exactly:

a daemon to provide process migration management between nodes using the openMosix 2.6 kernel extension for single-system image clustering.

in plain English:

a non-interactive system program to bind networked computers together as a group and make them behave as a single computer. This is achieved by monitoring system resources and processes; including the availability of other openMosix computers on the network.