The program cdd+, written by Komei Fukuda, is a C++ implementation of the double description method of Motzkin, et al., for generating all vertices and extreme rays of a general convex polyhedron in ℝd given by a system of linear inequalities. It is available at http://www.ifor.math.ethz.ch/~fukuda/cdd_home/, under the terms of the GNU General Public License, version 2.