You can download here the of SISCone source code. It is developped under the terms of the GNU General Public License (GPL). A version of the license should be included in the code.
The algorithm used by SISCone has been subject of a publication in JHEP 05 (2007) 086 [arXiv:0704.0292 (hep-ph)]. Please refer to that work each time it is appropriate.
Download SISCone 2.0.6 (latest stable - April 2013 - Release notes)
You can alternatively download SISCone from its SVN repository.
This can be browsed via HTTP access or accessed using the Subversion repository svn+ssh://svn.hepforge.org/hepforge/svn/siscone.