We present a freely available MATLAB code for the simulation of electron transport in arbitrary gas mixtures in the presence of uniform electric fields. For steady-state electron transport, the program provides the transport coefficients, reaction rates and the electron energy distribution function. The program uses established Monte Carlo techniques and is compatible with the electron scattering cross section files from the open-access Plasma Data Exchange Project LXCat. The code is written in object oriented design, allowing the tracing and visualization of the spatiotemporal evolution of electron swarms and the temporal development of the mean energy and the electron number due to attachment and/or ionization processes. We benchmark our code with well-known model gases as well as the real gases argon, N-2, O-2, CF4, SF6 and mixtures of N-2 and O-2. Program summary Program title: METHES Catalogue identifier: AEZY_v1_0 Program summary URL: http://cpc.cs.qub.ac.uk/summaries/AEZY_v1_0.html Program obtainable from: CPC Program Library, Queen's University, Belfast, N. Ireland Licensing provisions: GNU General Public License, version 3 No. of lines in distributed program, including test data, etc.: 28945 No. of bytes in distributed program, including test data, etc.: 515278 Distribution format: tar.gz Programming language: MATLAB R2014 (very likely compatible with earlier versions). Computer: Any which supports MATLAB. Operating system: Any which supports MATLAB. RAM: Variable, depending on number of electrons Classification: 19.11. Nature of problem: Simulation of electron transport in arbitrary gas mixtures in the presence of electric fields. Solution method: Monte Carlo Method. Running time: Depending on the computer and the desired precision of results between several minutes and several hours. (C) 2016 Elsevier B.V. All rights reserved.