A Study on Parallel Computation Tools on Networked PCs. Many models for natural phenomena, engineeringapplications and industries need powerfull computing resources to solve their problems. High Performance Computingresources were introduced by many researchers. This comes in the form of Supercomputers and with operating systemsand tools for development such as parallel compiler and its library. However, these resources are expensive for theinvestation and maintenance, hence people need some alternatives. Many people then introduced parallel distributedcomputing by using available computing resource such as PCs. Each of these PCs is treated as a processors, hence thecluster of the PC behaves as Multiprocessors Computer. Many tools are developed for such purposes. This paper studiesthe peformance of the currently popular tools such as Parallel Virta\ual Machine (PVM), Message Passing Interface(MPI), Java Remote Method Invocation (RMI) and Java Common Object Request Broker Architecture (CORBA).Some experiments were conducted on a cluster of PCs, the results show significant speed up. Each of those tools areidentified suitable for a certain implementation and programming purposes.