AbstractCC is a front-end to the abstract-cc framework.
The source is based on SableCC 3. The license for SableCC 3 is below. 

Copyright (C) 2010 Asger Feldthaus <asf@cs.au.dk>

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SableCC, an object-oriented compiler framework.
Copyright (C) 1997-2003 Etienne M. Gagnon <etienne.gagnon@uqam.ca> and
others.  All rights reserved.

See the file "AUTHORS" for the name of all copyright holders.

This program is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published
by the Free Software Foundation; either version 2.1 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
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with this program in the file "COPYING-LESSER"; if not,
write to the Free Software Foundation, Inc., 59 Temple Place,
Suite 330, Boston, MA  02111-1307  USA

The SableCC web site is located at:
http://www.sablecc.org/