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	Geomview - http://www.geomview.org/ Interactive 3D viewing program for Unix. Free under GPL.
	Topology and Geometry Software - http://www.geometrygames.org/ A collection of educational, graphical and research software by Jeff Weeks.
	CompuTop Software Archive - http://www.math.uiuc.edu/~nmd/computop/ Computational low-dimensional topology collected by Nathan Dunfield.
	Simplicial Homology - http://www.eecis.udel.edu/~dumas/Homology/ A proposed GAP share package. May be tried online.
	http://www.geometrygames.org/SnapPea/ - http://www.geometrygames.org/SnapPea/ A program for creating and studying hyperbolic 3-manifolds. Free source available in C.

	The Kenzo Program - http://www-fourier.ujf-grenoble.fr/~sergerar/Kenzo/ A computer program for computational algebraic topology.
	http://www.ms.unimelb.edu.au/~snap - http://www.ms.unimelb.edu.au/~snap Exact computation of hyperbolic 3-manifolds and their arithmetic invariants. Written by O. Goodman in an ARC-funded project of Hodgson and Neumann.
	http://vivaldi.ics.nara-wu.ac.jp/~wada/OPTi/ - http://vivaldi.ics.nara-wu.ac.jp/~wada/OPTi/ 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.
	Liverpool University Knot Theory Group Programs and Procedures - http://www.liv.ac.uk/~su14/knotprogs.html Four programs, each calculating some invariant from a closed braid presentation. Free to download. Pascal.
	http://www.math.uiowa.edu/~wu/min/ming.html - http://www.math.uiowa.edu/~wu/min/ming.html Computes the MD energy of a polygonal knot. Available via ftp.

SnapPea PC - http://home.att.net/~Manoharan/SnapPea/snappea.html
SnapPea for Windows 95/98/NT by A.C. Manoharan.

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