Circlepack is a c program for the creation, display, manipulation, and storage of circle packings using the x window system. computations may be done in either hyperbolic, euclidean, or spherical geometry, though the routines for the latter are not yet complete. for the theory behind the package, one must consult the research literature. one of the author's primary interests concerns the parallels between the developing theory of circle packings and the classical theory of analytic functions.
home page: http://www.math.utk.edu/~kens/