COBOL Compiler and COBOL Interpretor Directory
Links to several COBOL Compilers and Interpretors.
http://www.infogoal.com/cbd/cbdcmp.htm

TinyCOBOL Project
The TinyCOBOL Project is a COBOL compiler being actively developed by members of the free software community. It is being developed on the Linux OS, using a mix of C, LEX/YACC. It generates GNU assembler code, thus requires the GNU assembler and linker programs to create an executable binary.
http://tiny-cobol.sourceforge.net/

OpenCOBOL
An experimental implementation of a COBOL frontend for GCC. [Open source, LGPL]
http://www.open-cobol.org/gcc.html

LegacyJ PERCobol
LegacyJ provides an ANSI-85 and extensions COBOL compiler, with modern IDE (Eclipse). PERCobol compiles COBOL source to Java bytecode for execution as applications or within appservers, with maintenance and debug remaining in COBOL.
http://www.legacyj.com/lgcyj_perc1.html

Fujitsu NetCOBOL for .Net
NetCOBOL (previously called Fujitsu COBOL) for .Net is a complete COBOL development environment that allows you to create standalone COBOL applications and/or components for use with Microsoft visual tools.
http://www.netcobol.com/products/windows/netcobol.html

ICOBOL and VXCOBOL
Egan Systems, Inc. develops the ICOBOL and VXCOBOL programming environments
http://www.icobol.com/

Liant RM/COBOL
A portfolio of integrated tools that enables user to maintain a single set of source while deploying Cobol applications on the most popular open platforms.
http://www.liant.us/rm-cobol/rm-cobol-overview.html

Cobol For GCC
A project to produce a free COBOL compiler compliant with the COBOL 85 Standard, integrated into the GNU Compiler Collection (GCC).
http://cobolforgcc.sourceforge.net/

Wildcat COBOL Compiler for .NET
A COBOL compiler for .NET and Mono, written in C#. This compiler aims to support COBOL standards as well as integration with the .NET framework and object orientation.
http://www.sorn.net/projects/wildcat-cobol-compiler/