This F77 code solves the single, axisymmetric black hole spacetime which is distorted by the presence of an initially time symmetric gravitational wave (Brill wave). Also computed are the Zerilli function, Newman-Penrose scalars, Riemann invariants, Bel-Robinson vectors, apparent horizons (location, mass and embedding) and radiative losses.This code was written by Peter Anninos, David Bernstein, David Hobill, Ed Seidel, Larry Smarr, and John Towns at NCSA. Much of our work on distorted black holes is based on this code. You may download this code, and we encourage its use for studying black hole spacetimes, as long as credit and notification are provided. Please read the copyright notice in the code onebh.f, and keep it in the code. If you make useful modifications or extensions to the code, we would appreciate receiving a copy.