Exact computation of hyperbolic 3-manifolds and their arithmetic invariants. Written by O. Goodman in an ARC-funded project of Hodgson and Neumann.

A computer program for computational algebraic topology.

Interactive 3D viewing program for Unix. Free under GPL.

Macintosh freeware which visualizes quasi-conformal deformations of the once-punctured-torus groups. It interactively draws the isometric circles, the Ford region, and the limit set.

Four programs, each calculating some invariant from a closed braid presentation. Free to download. Pascal.

Computes the MD energy of a polygonal knot. Available via ftp.

SnapPea for Windows 95/98/NT by A.C. Manoharan.

A proposed GAP share package. May be tried online.

A program for creating and studying hyperbolic 3-manifolds. Free source available in C.

A collection of educational, graphical and research software by Jeff Weeks.