Moab Workload Manager is a High Performance Computing (HPC) resource management and job scheduler. It is designed and developed by the same developers as the popular Maui Scheduler, and it provides the same powerful cluster scheduling capabilities with the addition of events, resources, and grid policy engines.
PyDSH is a toolset to help simplify the administration of remote systems. The pydsh command enables running of a command on multiple hosts in parallel over RSH, SSH, or telnet, and manages your SSH public and private keys. The pydcp command enables SCP-like functions to and from multiple hosts in parallel.
distributed.net is a loosely knit group of computer users from all of the world that is taking up challenges requiring lots of computing power (most notably the RC5, DES, and OGR cracking contests). It is simple to participate in the challenges by downloading and running their client software (which uses idle CPU time to complete its tasks).
mod_backhand is a load balancing module for Apache. It provides per-request HTTP redirection within a heterogeneous Apache server cluster. Each request is processed and run through a set of "candidacy functions" to determine which server is best suited to respond. The request is then proxied to that server. Facilities are in place to allow you to write your own dynamically loadable decision making algorithms. Everything about the request and the current availability of resources can be used in the decision-making process.