UCL_PDR is an open-source 1D PDR code, written by Tom Bell and eventually inherited by me. The code can deal with arbitrary chemical networks, X-rays, line emission for any atom, molecule or ion for which collisional excitation rates are available and includes various other features described in this paper. The source code is available here. As the designated person in charge of maintaining the code, feel free to send any questions my way - a basic (somewhat UCL-centric) guide to installing and running the code is available here.