Gato is copyright © 2016-2020 AlexanderSchliep, copyright © 1998-2015 Alexander Schliep and Winfried Hochstättler, and copyright (c) 1998-2001 ZAIK/ZPR, an institute at the Unversität zu Köln. Gato is distributed under the Gnu Library General Public License (LGPL).
Gato is used in CATBox (the Combinatorial Algorithm Toolbox - an interactive course on discrete mathematics) available from Springer Verlag. You find binary releases of CATBox (© Springer Verlag 2011) including Gato at http://schliep.org/CATBox/.
Gato needs Python and Tcl/Tk. If you have never installed Gato before, you might want to check the installation page for information before proceeding. If you have installed Gato before, and just want to upgrade to a newer version, download the compressed archive file. Remember to download it as a binary.
You can download source releases from the Python Package index (PyPi) at http://pypi.python.org/pypi/Gato/, or from SourceForge at http://sourceforge.net/projects/gato/files/. There you also will find binaries. CATBox releases including Gato, both binary releases for Windows and MaxOS X as well as source releases, are available from http://schliep.org/CATBox/.
If you want to check out the very latest version you can use anonymous SVN access.
> svn checkout svn://svn.code.sf.net/p/gato/code/trunk/Gato Gato