GnuCOBOL (formerly OpenCOBOL)
GnuCOBOL (formerly OpenCOBOL) is a free COBOL compiler. cobc translates COBOL to executable using intermediate C sources, providing full access to nearly all C libraries.
OpenCOBOL 1.1 continued on as GNU Cobol 1.1. Officially posted to ftp://ftp.gnu.org/gnu/gnucobol, also available here.
GnuCOBOL 2.0 is on its way to a pre-release.
A superb manual by Gary Cutler, along with a FAQ / How-To, and other documentation is indexed at http://opencobol.add1tocobol.com/guides
OpenCOBOL 1.1 is
Copyright (C) 2001-2009 Keisuke Nishida
Copyright (C) 2007-2012 Roger While
As above, GnuCOBOL is also authored by Simon Sobisch, Sergey Kashyrin, Joe Robbins, Ron Norman
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, or (at your option) any later version.
The libcob run time support source tree is LGPL
GnuCOBOL (formerly OpenCOBOL) Web Site
Software Development, Compilers
GNU Library or Lesser General Public License version 2.0 (LGPLv2), GNU General Public License version 2.0 (GPLv2), GNU General Public License version 3.0 (GPLv3), GNU Library or Lesser General Public License version 3.0 (LGPLv3)
A nicely complete implementation of COBOL with nearly seamless C integration
Over 9700 NIST COBOL 85 test suite tests passed
Direct access to almost all C libraries, and a branched C++ version exists
Compiler built with GNU Autotools, also successfully builds with LLVM clang
CGI capable and desktop ready, GTK+ screens have been demonstrated
EXEC SQL preprocessors available for PostgreSQL, Firebird, ODBC, DB2
REPORT SECTION, SCREEN SECTION, FUNCTION-ID support