Parallel Virtual Machine is a software system enabling heterogeneous computers to be used as a single computational resource. It runs on a variety of architectures and networking conditions, and has bindings for many programming languages (most prominently C and Fortran). The official release is open source, although there are commercial implementations as well.
If your site contains primarily PVM documentation, please submit it to the Documentation category. Submit your site to the main PVM category if it is about an implementation of PVM, language bindings for PVM, monitoring or profiling tools, patches for specific architectures, or any other software that directly relates to PVM.
If your site is about software that just happens to be written using PVM, please find a place in Computers/Software for it based on what your software does.