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Regina – Software for 3-manifold topology and normal surface theory
Copyright (c) 1999–2011, The Regina development team
If you find Regina useful in your research, please consider citing it as you would any other paper that you use. See here for a suggested form of reference.
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
A full copy of the GNU General Public License should be included here; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
Regina makes use of external software for some specialised tasks. The corresponding license details are included below.
Regina includes portions of the SnapPea kernel, which it uses for some geometric calculations. SnapPea was written by Jeff Weeks, and is now maintained by both Jeff Weeks and Nathan Dunfield. The SnapPeaKernel is distributed under the terms of the GNU General Public License, version 2 or any later version, as published by the Free Software Foundation.
Regina includes snippets of code from Orb, for use in importing and exporting files in Orb / Casson format. Orb is based on SnapPea (see above) with additional code written by Damian Heard, who has also given permission for his code to be distributed under the terms of the GNU General Public License.