McStas perl tools to aid in running neutron ray tracing simulations. McStas is a tool for simulating neutron instrumentation and experiments using a ray-tracing formalism. Currently the main use of McStas is in the field of instrumentation design. This port contains a few perl-based helper tools (including a GUI) to aid the user in setting up and running simulations. The tools are: mcgui: A Tk/Perl based GUI. mcrun: A Script that makes it easy to run sims and perform point scans and simple optimizations. mcdoc: Script for viewing inline component documentation. mcplot: Tool for plotting McXtrace-generated results. mcdisplay: Visual ray-tracing displaying neutron trajectories. mcformatgui: Front-end to mxformat to help reformat data-files (obsolescent). mcdaemon: Deamon to dynamically monitor and plot results (obsolescent). mcstas2vitess: Tool to transfer a McStas simulation to ViTESS. mcresplot: Script to help plotting resolution functions. WWW: http://www.mcstas.org