The communities page shows spaces for entire logic-solving communities. If you are in the community or the community is public, you should see it listed on this page. You can request to join or leave a community, and you can also download the community's processors, registered with StarExec by the community leaders. Processors are currently likely to be scripts, but could also be arbitrary programs.
Benchmark processors: these can be run when benchmarks are uploaded, to check syntactic properties of the benchmark and to extract benchmark attributes of interest for the community. Those attributes are then stored in the StarExec database.
Postprocessors: these are called on the output a solver produces for a single benchmark, and can again extract arbitrary attributes for the database, including a special attribute starexec-result, intended to represent the logical status returned by the solver for the benchmark.