Post-processors are stand-alone applications that use output files produced by the Forest Vegetation Simulator (FVS) to perform additional computations. The Suppose graphical user interface program can launch the post-processors as part of a simulation run. The post-processors may also be run outside of the Suppose environment. Many post-processors require specific keywords in the FVS simulation file. Some post-processors write additional information to the main FVS output file. Others produce their own custom reports or launch separate programs. This guide describes each post-processor and its use.