Farideh Dormishian and Rudy Rucker's Hypercube 98 - The program shows tumbling four-dimensional hypercubes, as well as some 3D polyhedra, and some 2D snowflakes. Shareware for Windows.Bob Allanson's Polyhedra Pages - Images and software. Poly is a DOS program that can be used to study the truncations and transformations of the Platonic Solids. Free download.
PEEK - A program to interactively explore arbitrary dimension polytopes through the use of cross-sections and projections.
PPL: The Parma Polyhedra Library - A C++ library for the manipulation of convex polyhedra. Distributed under the terms of the GNU General Public License.
POLY - Software for exploring and constructing polyhedra. Flattened versions (nets) of polyhedra may be printed and then cut out, folded, and taped, to produce three-dimensional models. Shareware download (Mac/Win).
Polyhedra 2001 - OpenGL program which displays the Uniform Polyhedra and related shapes in real time. The Uniform Polyhedra may be morphed in to their dual, exploded, truncated and unfolded into a net. Free download.
Stella (Great and Small) - A program for creating, visualising, and printing nets for polyhedra. Download .EXE format.