The Geometry Center was a mathematics research and education center at the University of Minnesota. It was established by the National Science Foundation in the late 1980s and closed in 1998. The focus of the center's work was the use of computer graphics and visualization for research and education in pure mathematics and geometry. The center's founding director was Al Marden. Richard McGehee directed the center during its final years. The center's governing board was chaired by David P. Dobkin. Geomview Much of the work done at the center was for the development of Geomview, a three-dimensional interactive geometry program. This focused on mathematical visualization with options to allow hyperbolic space to be visualised. It was originally written for Silicon Graphics workstations, and has been ported to run on Linux systems; it is available for installation in most Linux distributions through the package management system. Geomview can run under Windows using Cygwin and under Mac OS X. Geomview has a web site at . Geomview is built on the Object Oriented Graphics Library (OOGL). The displayed scene and the attributes of the objects in it may be manipulated by the graphical command language (GCL) of Geomview. Geomview may be set as a default 3-D viewer for Mathematica. Videos Geomview was used in the construction of several mathematical movies including: Not Knot, exploring hyperbolic space rendering of knot complements. Outside In, a movie about sphere eversion. The shape of space, exploring possible three dimensional spaces. Other software Other programs developed at the Center included: WebEQ, a web browser plugin allowing mathematical equations to be viewed and edited. Kali, to explore plane symmetry groups. The Orrery, a Solar System visualizer. SaVi, a satellite visualisation tool for examining the orbits and coverage of satellite constellations. Crafter, for structural design of spacecraft. Surface Evolver, to explore minimal surfaces. SnapPea, a hyperbolic 3-manifold analyzer. qhull, to explore convex hulls. KaleidoTile, to explore tessellations of the sphere, Euclidean plane, and hyperbolic plane. Website Richard McGehee, the center's director, has stated that the website was one of the first one hundred websites ever published. Despite the Center being closed, its website is still online at as an archive of a wide range of geometric topics, including: Geometry and the Imagination handouts for a two-week course by John Horton Conway, William Thurston and others. Science U, a collection of interactive exhibits. The Geometry Forum, an electronic community focused